
Doc is part of an Army horse cavalry unit from Texas.
When the Army celebrates its 250th birthday on June 14, a date that just so happens to be President Donald Trump’s 79th birthday, the streets of Washington, D.C., will be filled with marching troops and tanks as World War II airplanes and Vietnam War-era helicopters swoop overhead.
Also included in the parade will be 34 horses, two mules, one wagon and a dog.
Army Col. Kamil Sztalkoper, a spokesman for the III Armored Corps, said the dog is a Blue Heeler (aka an Australian Cattle Dog) named “Doc Holliday” — likely a nod to the famous gunslinger played by Val Kilmer in the movie “Tombstone.”

Doc, a sweet and playful pup from the Army’s 1st Cavalry Division at Fort Cavazos, is parade-ready. Having marched in Pasadena’s Rose Parade, Doc will now ride his wagon to Washington, D.C., for the Army’s milestone celebration. The event, backed by Trump, features 6,700 troops, costly logistics, and historic patriotic fanfare.