The initial idioms of the letter U

U	U. S. Air Force
U. S. Army	U. S. Army Special Forces
U. S. Coast Guard	U. S. Code
U.S.	U.S. Army Criminal Investigation Laboratory
U.S. Congress	U.S. Constitution
U.S. government	U.S. House
U.S. House of Representatives	U.S. Mint
U.S. National Library of Medicine	U.S. Senate
U.S. waters	U308
uakari	Ubermensch
ubiety	ubiquinone
ubiquitous	ubiquitousness
ubiquity	U-boat
Ubykh	Uca
UDA	udder