278th Armored Cavalry Regiment

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278th Armored Cavalry Regiment
Shoulder sleeve insignia
Active	1887–present
Country	United States of America
Branch	United States Army
Type	Armored brigade combat team
Part of	Tennessee Army National Guard(3rd Squadron – Texas Army National Guard)
Garrison/HQ	Knoxville, Tennessee
Nickname(s)	Third Tennessee[1]
Motto(s)	"I Volunteer, Sir!"
Engagements	American Revolutionary War War of 1812 Mexican War American Civil War War with Spain Mexican Expedition World War I World War II Korean War Iraq Campaign Operation Atlantic Resolve
Insignia
Coat of Arms
Distinctive unit insignia

The 278th Armored Cavalry Regiment (278th ACR, "Third Tennessee"^[1]), previously the 117th Infantry Regiment, is an armored brigade combat team of the Tennessee Army National Guard with headquarters in Knoxville, Tennessee. It is the only National Guard Armored Cavalry Regiment and one of only two in the entire US Army order of battle, the other being the active duty 11th ACR. The unit traces its lineage from the volunteer militias of Eastern Tennessee and has participated in conflicts from the Revolutionary War to the Global War on Terror.