Weapon systems officer (WSO), either a United States Navy air flight officer directly involved in all air operations and weapon systems of a fighter aircraft or the aft crew member in a United States Air Force F-15E Strike Eagle or B-1 Lancer or a United States Marine Corps F/A-18D Hornet
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Infantry Weapons Officer, a United States Marine Corps chief warrant officer who is a technical weapons specialist
Chief Executive Officer | chief executive officer | Organisation for the Prohibition of Chemical Weapons | Chief executive officer | General officer | Commanding Officer | police officer | non-commissioned officer | Chief Operating Officer | Chief operating officer | general officer | Chief Financial Officer | Officer Candidate School | Foreign Service Officer | Non-commissioned officer | Naval Air Weapons Station China Lake | Master Chief Petty Officer of the Navy | Federal Assault Weapons Ban | commissioned officer | commanding officer | Police officer | executive officer | Authorised Firearms Officer | Atomic Weapons Establishment | Second Officer | John Pope (military officer) | Future Weapons | Fort Des Moines Provisional Army Officer Training School | Commissioned officer | Chief Information Officer |