Pierre (Peter) Julien Ortiz OBE was a United States Marine Corps colonel who received two Navy Crosses for extraordinary heroism as a major in World War II. He served in North Africa and Europe during the war, as a member of the French Foreign Legion, the U.S. Marines and the Office of Strategic Services (OSS), operating behind enemy lines several times. Ortiz also acted in Hollywood films after the war. He was one of the very few U.S. Marines to serve in combat in Europe during World War II, and one of the most decorated Marine officers of the war.

The Office of Strategic Services (OSS) was the intelligence agency of the United States during World War II. The OSS was formed as an agency of the Joint Chiefs of Staff (JCS) to coordinate espionage activities behind enemy lines for all branches of the United States Armed Forces. Other OSS functions included the use of propaganda, subversion, and post-war planning.