Commissioned an officer in 1988, Horn has served aboard the , as well as with the
4th Light Armored Reconnaissance Battalion,
23rd Marine Regiment and
Marine Aircraft Group 46. In 2003, he was recalled from reserve duty to active duty to serve in the
War in Afghanistan (2001–present) and the
Iraq War with the
3rd Marine Aircraft Wing. Following mobilization, Horn was assigned to be deputy force chaplain, Reserve Matters,
Marine Forces Pacific. He was later assigned to
Headquarters Marine Corps. Awards he has received include the
Legion of Merit, two award stars; the
Meritorious Service Medal with two
award stars and the
Navy Achievement Medal with two award stars. ==References==