green card soldier n.— «There are tens of thousands of foreign-born members in the U.S. armed forces. Many have been naturalized, but more than 20,000 are not U.S. citizens. “Green card soldiers,” they are often called, and...
backdoor draft n. extension of military enlistments through stop-loss orders, which force personnel to involuntarily extend their tours of duty. (source: Double-Tongued Dictionary)