Abbreviation:C of SorCOS Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014 Chief′ of Staff′ n. 1.the senior officer of the U.S. Army or Air Force and a member of the Joi...
Sergeant US Army Enlisted Soldier Initial Entry Training (IET) US Army Warrant Officer Selection & Training US Army Officer Candidate School (OCS) US Marine Corps Recruit (Phase 1) Training An Overview of the US Marine Corps’ Drill Instructor US Marine Corps Officer Candidates...