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I & I

Inspector and Instructor. The active duty cadre assigned to a Marine Corps reserve unit.  Also an alternate term for R&R (rest and recuperation, usually from a battle zone), called "intoxication and intercourse."

I Corps

(Vietnam)The most northern of four Corps areas into which South Vietnam was divided. I Corps was Marine territory while the Army controlled II, III and IV Corps.


Individual Memorandum of Receipt. The form used to issue 782 Gear.


(Vietnam) Itty Bitty Gook Boats. Small Vietnamese fishing junks in the DaNang area. Early in the 1960s they were prevalent but by the end of the decade they were nearly extinct.


Infantry Combat Boots

Ice plant

(Vietnam) See Grass.

ID 10 Tango

Sometimes India Delta 10 Tango or, without the phonetics, ID10T and without the numbers IDIOT.  One is sometimes asked to locate the ID 10 Tango Form.


(Iraq) Improvised Explosive Device.


Inspector General.

Ike Jacket

The term was not authorized in the Marine Corps and when used would subject a Marine to a reprimand. Marines remembered General Eisenhower's comment that he would have no Marines in Europe (having forgotten that his reserve force in Northern Ireland was Marine and paying no attention to the OSS personnel in the theater). A uniform jacket of similar design was authorized just after World War II and continued into the early 1960s. It was a forest green fabric with a faux belt and no skirt below the belt. See Battle Jacket.


Night artillery fire used to illuminate an area using a phosphorous filament suspended by a parachute.

Improvise, Adapt and Overcome

An unofficial mantra of the Marine Corps based on the fact that the Corps generally received Army hand-me-downs and the troops were poorly equipped. Despite this, the Marine Corps has been successful mostly because of the creativity of its people and their success-based attitude.

In Country

(Vietnam) Serving (or having served) in Vietnam. (Iraq) Serving (or having served) in Iraq. Often used to refer to any current combat zone.

In the Fleet

See Fleet.


An artillery shell that burns upon impact, usually stuffed with white phosphorous.

Incentive Training

Physical exercise used as a punishment to instill motivation, particularly in a Marine recruit during boot camp. Also called quarterdecking or being pitted (as outside it is usually conducted in a special sand pit designed for the purpose)


An alert that something is coming at you, often enemy fire or artillery.

Indian Territory

(Vietnam) Enemy held areas.

Infantry Training Battalion

See School of Infantry.

Initial Strength Test

A physical test given early in the training of a recruit to determine if the recruit meets minimum fitness standards and to set a baseline for measuring progress.

Ink Stick

Pen (a writing instrument).

Irish Pennant

A string hanging randomly from a Marine’s uniform. Longer ones are sometimes called rappelling ropes or cables. A squared away Marine will be free of Irish pennants, particularly at an inspection.  Appears to have originated after World War II and referred originally to the green-colored service or class A uniform due to the connection between the Irish and the color green.

Iron Mike

A statue of a World War I Marine at Quantico, VA with a copy on Parris Island, SC. The original was made by the government of France to thank the Americans for their aid in World War I. When it was presented to General Pershing he noticed that the Doughboy holding aloft an M1911 A1 pistol had a Marine Corps emblem on his helmet. Pershing refused to accept the sculpture and it was given to the Marines with the understanding that it would never appear in Washington, DC.


Incentive Training.


Infantry Training Battalion. See School of Infantry


Infantry Training Regiment. The old name for Infantry Training Battalion.

  Iwo Jima   The invasion of Iwo Jima began on February 19, 1945, and continued to March 26, 1945. The battle was a major initiative of the Pacific Campaign of World War II. The Marine invasion, known as Operation Detachment, was charged with the mission of capturing the airfieldson the island which up until that time had harried U.S. bombing missions to Tokyo. Once the bases were secured, they could then be of use in the impending invasion of the Japanese mainland. (thanks Wikipedia)  The flag raising has become a universally recognized icon of the U. S. Marine Corps.  The image most recognized was taken by Joe Rosenthal of the Associated Press and received the Pulitzer Prize. It is often cited as the "most reproduced photograph of all time.  It depicts five Marines and a Navy Hospital Corpsman raising the second flag on top of Mount Suribachi.  The first flag was raised by a squad of  Easy Company, 2nd Battalion, 28th Marines, 5th Marine Division and was photographed by Marine Staff Sergeant Lou Lowery, a photographer with Leatherneck magazine.  The first flag was too small to be seen from the beaches and was replaced. to another web site with more info. additional reading on this topic.

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© Glenn B. Knight, 2002-2009

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