HOOAH - or - HOOYAH - or - HOORAH - or - just the old American Civil War chant, HURRAH - HURRAH

It's all either Army or Navy.

Hooah is the war cry or battle cry used by the United States Army.

Hooyah is the war cry or battle cry used by the United States Navy.

Hoorah or Oorah is the war cry or battle cry used by the United States Marines.

Each of the uniformed services is administratively headed by a federal executive department and its corresponding civilian Cabinet leader. The seven uniformed services are, in order of precedence by ceremonial formation: 

United States Army

United States Marine Corps

United States Navy

United States Air Force

United States Coast Guard

United States Public Health Service Commissioned Corps

National Oceanic and Atmospheric Administration Commissioned Officer Corps

Hooah 

There are many rumors of it's origin, but the simplest and probably most accurate is it's derived from the acronym HUA, meaning Heard, Understood, Acknowledged, or just plain US Army slang for YES.

The United States Army (USA) is the largest branch of the Armed Forces of the United States that performs land-based military operations; and is one of the seven Uniformed services of the United States. As the largest and senior branch of the U.S. military, the modern U.S. Army has its roots in the Continental Army, which was formed (14 June 1775) to fight the American Revolutionary War (1775–83)—before the U.S. was established as a country. 

After the Revolutionary War, the Congress of the Confederation created the United States Army on 3 June 1784, to replace the disbanded Continental Army. The United States Army considers itself descended from the Continental Army, and dates its institutional inception from the origin of that armed force in 1775.

The United States Air Force (USAF) is the aerial warfare service branch of the United States Armed Forces and one of the seven American uniformed services. Initially part of the United States Army, as the Army Air Corps, the USAF was formed as a separate branch of the military on 18 September 1947 under the National Security Act of 1947. It is the most recent branch of the U.S. military to be formed, and is the largest and one of the world's most technologically advanced air forces. The USAF articulates its core functions as Nuclear Deterrence Operations, Special Operations, Air Superiority, Global Integrated ISR, Space Superiority, Command and Control, Cyberspace Superiority, Personnel Recovery, Global Precision Attack, Building Partnerships, Rapid Global Mobility and Agile Combat Support.

In the fiscal year 2011, the Regular Army (USA) reported a strength of 546,057 soldiers; the Army National Guard (ARNG) reported 358,078 soldiers, and the United States Army Reserve (USAR) reported 201,166 soldiers; the combined-component strength of the U.S. Army was 1,105,301 soldiers. As a branch of the armed forces, the mission of the U.S. Army is "to fight and win our Nation's wars, by providing prompt, sustained, land dominance, across the full range of military operations and the spectrum of conflict, in support of combatant commanders.

The U.S. Air Force provides air support for surface forces and aids in the recovery of troops in the field. As of 2012, the service operates more than 5,638 military aircraft, 450 ICBMs and 63 military satellites. It has a $140 billion budget with 309,339 active duty personnel, 185,522 civilian personnel, 71,400 Air Force Reserve personnel, and 106,700 Air National Guard personnel.

Hooyah 

More likely an offshoot of the US Army version, with a Navy spin of "Who US - Who YA", just to be different. It is used to say Ok or understood or is sometimes used to show enthusiasm.

The U.S. Navy traces its origins to the Continental Navy, which was established during the American Revolutionary War and was essentially disbanded as a separate entity shortly thereafter. It played a major role in the American Civil War by blockading the Confederacy and seizing control of its rivers. It played the central role in the World War II defeat of Japan. The 21st century U.S. Navy maintains a sizable global presence, deploying in such areas as East Asia, the Mediterranean, and the Middle East. It is a blue-water navy with the ability to project force onto the littoral regions of the world, engage in forward areas during peacetime, and rapidly respond to regional crises, making it an active player in U.S. foreign and defense policy.

The United States Navy (USN) is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest, most powerful navy in the world, with the highest combined battle fleet tonnage. The U.S. Navy has the world's largest aircraft carrier fleet, with ten in service, four in the reserve fleet, and three new class carriers under construction. The service has 325,143 personnel on active duty and 107,355 in the Navy Reserve. It has 272 deployable combat ships and more than 3,700 aircraft in active service as of March 2015.

Hoorah - United States Marines pronounce it "OohRah!"
The 1st Amphibious Reconnaissance Company, FMFPAC can be credited with the introduction of "Ooh-rah!" into the Marine Corps in 1953, shortly after the Korean War. Recon Marines served aboard the USS Perch (ASSP-313), a WWII-era diesel submarine retrofitted to carry Navy UDT and Recon Marines. Whenever the boat was to dive, the 1MC (PA system) would announce "DIVE! DIVE!", followed by the sound of the diving klaxon: "AARUGHA!"
In 1953 or 1954, while on a conditioning run, former Sergeant Major of the Marine Corps John R. Massaro, while serving as company Gunnery Sergeant of 1st Amphibious Reconnaissance Battalion, simulated the "Dive" horn sound "AA-RUG-HA!" as part of the cadence. Legend has it, he took it with him when he went to serve as an instructor at the Drill Instructor school at Marine Corps Recruit Depot San Diego. He there passed it on to the Drill Instructor students and they, in turn, passed it on to their recruits where it eventually and naturally became a part of the Recon cadence, and thereafter infiltrated Recon Marine lexicon. 
Over time, "AARUGHA!" morphed into the shorter, simpler "Oorah!" 

The Marine Corps has been a component of the U.S. Department of the Navy since 1834, working closely with naval forces for training, transportation, and logistics. The USMC operates posts on land and aboard sea-going amphibious warfare ships around the world, and several of the Marines' tactical aviation squadrons, primarily Marine Fighter Attack squadrons, are also embedded in Navy carrier air wings and operate from the Navy's nuclear-powered aircraft carriers.

The United States Marine Corps (USMC) is a branch of the United States Armed Forces responsible for providing power projection from the sea, using the mobility of the U.S. Navy to rapidly deliver combined-arms task forces. The U.S. Marine Corps is one of the four branches in the U.S. Department of Defense as a member of the Joint Chiefs of Staff. It is one of the seven uniformed services of the United States.

By the mid-20th century, the U.S. Marine Corps had become a major theorist and the dominant practitioner of amphibious warfare. Its ability to rapidly respond on short notice to expeditionary crises gives it a strong role in the implementation and execution of American foreign policy. The USMC has around 194,000 active duty members and just under 40,000 reserve Marines as of 2010. It is the smallest of the U.S. Armed Forces within the U.S. Department of Defense.

Hurrah! Hurrah!

Could it all have really started during the American Civil War with the popular song by Patrick Gilmore, When Johnny Comes Marching Home Again Hurrah! Hurrah!

The lyrics to When Johnny Comes Marching Home Again Hurrah! Hurrah! were written by the Irish-American bandleader Patrick Gilmore during the American Civil War, around 1863-1864. 

A popular song of the war that expressed people's longing for the return of their friends and relatives who were fighting in the war.

When Johnny Comes Marching Home was immensely popular and was sung by both sides of the American Civil War.

When Johnny comes marching home again
Hurrah! Hurrah!
We'll give him a hearty welcome then
Hurrah! Hurrah!
The men will cheer and the boys will shout
The ladies they will all turn out
And we'll all feel gay,
When Johnny comes marching home!

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The Story of Halloween

Halloween's origins date back to "the ancient Celtic festival of Samhain",which means summer's end.  Roughly 2,000 years ago, a people known as the Celts lived in the area now divided among three modern-day countries: the United Kingdom, Northern France, and Ireland. The Celts began their new year on November 1, meaning October 31 was their New Year's Eve, and the time, they believed, when the dead came back to roam the earth. Evil spirits were warded off by lighting bonfires and wearing costumes to hide from them. According the History Channel, "the boundary between the worlds of the living and the dead became blurred" that night. Turnips carved with faces got placed in windows to scare off the unwelcome undead. People would go "a-souling," and in exchange for food and drink, pray for a household's dead relatives. In Scotland, spirits were impersonated by men wearing all white with veiled faces. Bonfires and animal sacrifices were common, as were costumes "typically consisting of animal heads and skins." Eventually, the Romans conquered the Celts, and Samhain was combined with other holidays. Later, as Christianity became more powerful, Pope Boniface IV put a new tilt on the event. He designated November 1 "All Saints' Day" -- a day when followers could honor saints and martyrs.

The Celtic holiday of Samhain, the Catholic Hallowmas, also called "All-Hallows". period of All Saints' Day and All Souls' Day and the Roman festival of Feralia all influenced the modern holiday of Halloween. In the 19th century, Halloween began to lose its religious connotation, becoming a more secular community-based children's holiday. Although the superstitions and beliefs surrounding Halloween may have evolved over the years, as the days grow shorter and the nights get colder, people can still look forward to parades, costumes and sweet treats to usher in the winter season.

These days, Halloween is mostly known as a day when kids throw dental hygiene out the window and go hog-wild with candy. The origin of trick-or-treating is somewhat disputed. In the second half of the nineteenth century, America was flooded with new immigrants. These new immigrants, especially the millions of Irish fleeing Ireland's potato famine of 1846, helped to popularize the celebration of Halloween nationally. Taking from Irish and English traditions, Americans began to dress up in costumes and go house to house asking for food or money, a practice that eventually became today's "trick-or-treat" tradition. Young women believed that, on Halloween, they could divine the name or appearance of their future husband by doing tricks with yarn, apple parings, or mirrors. Today, Americans spend an estimated $6.9 billion annually on Halloween, making it the country's second largest commercial holiday.
(History Channel) http://www.history.com/topics/halloween

The First Jack O'Lantern
The Irish carved Turnips and put coals or small candles inside. They were placed outside their homes on All Hallow's Eve to ward off evil spirits. They were also known to use potatoes and Rutabagas. When Irish Immigrants came to America, they quickly discovered that Jack O'Lanterns were much easier to carve out and began using them. This truly neat tradition quickly spread to the general population in America and elsewhere. Others believe that the first Jack O'Lanterns came from the Story of Stingy Jack. http://www.history.com/topics/jack-olantern-history

Dia De Los Muertos
In English, this holiday translates to "The Day of the Dead". It is an important Mexican holiday. Where Americans shy away from the topic of death, Mexicans embrace it. On this day, they celebrate it in a big way. Asian cultures are also known to honor the dead in October.

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The Legend of Stingy Jack

People have been making "Jack O'Lanterns" at Halloween for centuries. The practice originated from an Irish myth about a man nicknamed "Stingy Jack." According to the story, Stingy Jack invited the Devil to have a drink with him. True to his name, Stingy Jack didn't want to pay for his drink, so he convinced the Devil to turn himself into a coin that Jack could use to buy their drinks. Once the Devil did so, Jack decided to keep the money and put it into his pocket next to a silver cross, which prevented the Devil from changing back into his original form. Jack eventually freed the Devil, under the condition that he would not bother Jack for one year and that, should Jack die, he would not claim his soul. The next year, Jack again tricked the Devil into climbing into a tree to pick a piece of fruit. While he was up in the tree, Jack carved a sign of the cross into the tree's bark so that the Devil could not come down until the Devil promised Jack not to bother him for ten more years.

Soon after, Jack died. As the legend goes, God would not allow such an unsavory figure into heaven. The Devil, upset by the trick Jack had played on him and keeping his word not to claim his soul, would not allow Jack into hell. He sent Jack off into the dark night with only a burning coal to light his way. Jack put the coal into a carved-out turnip and has been roaming the Earth with ever since. The Irish began to refer to this ghostly figure as "Jack of the Lantern," and then, simply "Jack O'Lantern."

In Ireland and Scotland, people began to make their own versions of Jack's lanterns by carving scary faces into turnips or potatoes and placing them into windows or near doors to frighten away Stingy Jack and other wandering evil spirits. In England, large beets are used. Immigrants from these countries brought the jack o'lantern tradition with them when they came to the United States. They soon found that pumpkins, a fruit native to America, make perfect Jack O'Lanterns.

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