commissioned officer

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An officer who holds a commission and ranks as a second lieutenant or above in the US Army, Air Force, or Marine Corps, or as an ensign or above in the US Navy or Coast Guard.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a military officer holding a commission