commissioned officer

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An officer who holds a commission and ranks as a second lieutenant or above in the U.S. Army, Air Force, or Marine Corps, or as an ensign or above in the U.S. Navy or Coast Guard.

Wiktionary

1. n. military An officer who derives authority directly from a sovereign power and, as such, hold a commission charging them with the duties and responsibilities of a specific office or position.

WordNet 3.0

1. n. a military officer holding a commission