Original sentence: The Manned Spaceflight Engineer Program was an effort by the United States Air Force (USAF) to train American military personnel as payload specialists for Department of Defense (DoD) payloads on the Space Shuttle program
Edited sentence: The Manned Spaceflight Engineer Program was an effort by the United States Air Force (USAF) to train American military personnel as payload specialists for Department of Defense (DoD) missions on the Space Shuttle program