Candidate Crossing Marine officer candidates participate in three months of training at the Officer Candidates School at Marine Corps Base Quantico, Va., March 14, 2018. The school evaluates individuals for the leadership, moral, mental, and physical qualities required for commissioning as a U.S. Marine Corps officer. Marine Corps Photo by Staff Sgt. Melissa Marnell SHARE: Download: Full Size (1.65 MB) Credit: Staff Sgt. Melissa Marnell VIRIN: 180314-M-DY697-0056C.JPG Photo Gallery