Construction Apprentice CA – Cruiser, Armoured, class/type of ship. Heavy Cruiser (outdated) CAG – Cruiser, Attack, Guided Missile, class/type of ship. Guided Missile Heavy Cruiser (outdated) CAG – Commander, Air Group CAPT – Captain CBMU – Construction Battalion Maintenance Unit CASCAN – CASREP Cancellation or Cancellation of Casualty Report CASCOR – CASREP Correction or Correction of the Casualty in the Casualty Report CASREP – Casualty Report CC – Cruiser, class/type of ship CCC – Comprehensive Communications Check CDB – Career Development Board CDC – Combat Direction Center (CIC on carriers) CDO – Command Duty Officer CDR – Commander CE – Construction Electrician CEC – Civil Engineer Corps CEC – Cooperative Engagement Capability CED – Current Enlistment Date CENTCOM – U.S. Central Command (USCENTCOM) CF – Charlie Foxtrot (polite form of "Cluster Fuck") CG – Cruiser, Guided Missile, class/type of ship CGN – Cruiser, Guided Missile, Nuclear, class/type of ship (outdated) CHC – Chief of Chaplains of the United States Navy CHENG – Chief Engineer (surface only) CHMC – Chaplain of the United States Marine Corps (always a Navy flag officer) CIC – Combat Information Center CICO – Combat Information Center Officer CIS – CASREP Information System CIVLANT – "Civilian Life" as defined by Atlantic Fleet personnel CIVPAC – "Civilian Life" as defined by Pacific Fleet personnel CIWS – Close-In Weapon System CM – Construction Mechanic CMC – Commandant of the Marine Corps or Chaplain of the Marine Corps or Command Master Chief CMDCM – Command Master Chief CMDCS – Command Senior Chief CMS-ID – Career Management System-Interactive Detailing CN – Constructionman CNATRA – Chief of Naval Air Training CNAVRES – Chief of Navy Reserve CNET – Command Naval Education and Training CNIC – Commander, Navy Installations Command CNO – Chief of Naval Operations CO – Commanding Officer COB – Chief of the Boat (traditionally found only on submarines; pronounced "cob"). Can also be used for "close of business" (pronounced "C-O-B"). COD – Carrier Onboard Delivery COMCVW – Commander, Carrier Air Wing COMDESGRU – Commander, Destroyer Group COMDESRON – Commander, Destroyer Squadron COMEX – Commence Exercise COMLANTFLT – Commander, U.S. Atlantic Fleet COMMO – Communications Officer COMNAVAIRES – Commander, Naval Air Force, Reserve COMNAVAIRFOR (also CNAF) – Commander, Naval Air Forces COMNAVAIRLANT (also CNAL) – Commander, Naval Air Force Atlantic COMNAVAIRPAC – Commander, Naval Air Force Pacific COMNAVRESFOR – Commander, Navy Reserve Forces COMNAVSEASYSCOM – Commander, Naval Sea Systems Command COMNAVSECGRU