Look up "just war" in the encyclopedia and you'll find yourself reading -

WAR, JUST: See United States of America, Military History of.

Perhaps a picture will be provided:

Caption (from Fox News): U.S. Marine Lance Cpl. Marcco Ware carries an injured Iraqi soldier Tuesday morning, March 25, 2003 in central Iraq.

The Arsenal of Democracy. Undefeated in spirit, unmatched in valor.