U.S. Marine Corps Dictionary

O

O

Lieutenant of Marines. (see Mameluke Sword)

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Old Hat

Stale or unchanged information. Information that is already known.

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Over and Out

(Commtalk)Does not exist–an oxymoron. Similar to saying “I am signing off, do not reply, it”s your turn to talk.”

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Obstacle Course

A series of physical barriers over which a Marine must cross in a race against time. (see Confidence Course)

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On Station

Usually refers to a ship being at its assigned position on the ocean. Also sometimes used to mean on duty.

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Over the Hill

Unauthorized absence.

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Oceanside

The civilian community outside the main gate of Camp Pendleton, CA.

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Once a Marine, Always a Marine

The motto of the Marine Corps League.

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Overhead

Naval term for ceiling.

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OCS

Officer Candidates School.

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Onion head

1. a newbie or green troop. (background) Refers to the pitiful cueball-ish hair cut that new recruits get during basic training.

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Overstreat, Harold G

Twelfth Sergeant Major of the Marine Corps serving from June 28, 1991 until June 29, 1995. He was born in December of 1944 in Houston, TX.

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OD

Olive drab. Official color of utility and fatigue uniforms worn prior to the introduction of BDUs or cammies. (background) The term was replaced by Sage Green and then simply Green.

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Ontos

A Vietnam-era fighting vehicle that looked like a small tank with six externally mounted 105mm recoilless rifles attached. Ammunition and a loader were carried inside but he had to get out to load the tubes. When all six rifles were fired, at the same time the Ontos would stand up on its hind section. (origin) The word is reportedly Greek for “thing”.

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OfficeHours

A non-judicial hearing for minor offenses at which NJP (non-judicial punnishment) may be issued by a commanding officer.

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Ooohraah

A sound made by a Marine to indicate agreement or to provide encouragement.

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OfficePogue

An office clerk. see Remington Raider.)

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OP

Observation Post.

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Officer

General use refers to commissioned officers and warrant officers. Non-commissioned officers are also officers but are generally referred to as NCOs or specific rank.

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Operation Golden Flow

Military term used for a routine urinalysis test.

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Officer Candidates School

A training program for motivated college graduates who have been screened by the Marine Corps for the qualities necessary to become a leader of Marines. Upon graduation, they are commissioned Second Lieutenant of Marines. The selection process begins with the Recruiting Command’s Officer Selection Officer.

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OpTempo

Operational Tempo; how frequently a unit deploys or goes to the field.

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Officers”Country

The area aboard ship where the commissioned officer living compartments are located. Off limits to all enlisted personnel unless on official duty.

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Order of the Golden Dragon

Awarded for crossing the International Date Line. (see Line Crossing Ceremony.)

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Oh Dark Thirty

(see “0 Dark Thirty”)

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Orderly Sergeant

The highest ranking enlisted rank in the Marine Corps during the Civil War. Most of the ships’ Marine Detachments were commanded by Orderly Sergeants. Not presently in use.

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OIC

Officer in Charge. A commissioned or warrant officer placed in charge of a group of Marines or a project. This person is not a commander and does not have the UCMJ authority vested in a commander.

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Oscar

1. The name of the dummy used for man overboard drills. Also, the flag that is hoisted when there is a man overboard. 2. The flag for the letter O.

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OIF

Operation Iraqi Freedom. Sometimes called the Second Gulf War.

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OSO

Officer Selection Officer.

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OIF II

Operation Iraqi Freedom II. The Iraqi War after the “mission accomplished” announcement of the “end of major hostilities.”

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Out

(Commtalk) “I am signing off. Do not reply.” Thus, “over and out” is a contradiction.

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Oki

Okinawa. An island south of Japan owned by the U. S. Government until the 1970s when it was turned over to Japan. Still a major Marine Corps installation, it was used during Vietnam as a staging point for troops going into and out of Vietnam.

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Outfuckingstanding

A Marine expletive meaning very good.

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Old Goat

(see Goat Locker.)

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Over

(Commtalk) “I am finished talking, it”s your turn to talk.”

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About DevilDogCorps.com

DevilDogCorps.com is an unofficial online dictionary of terms and acronyms commonly used within the United States Marine Corps.