Noun:
1: united states, u.s., us, the states, america, usa, u.s.a., united states of america North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
2: army, us army, united states army, usa, u. s. army the army of the United States of America; the agency that organizes and trains soldiers for land warfare