3d Battalion 12th Marines

ARTP 23.2 M777

U.S. Navy Corpsmen and Marines transport a simulated casualty onto a Japan Ground Self-Defense Force UH-1 helicopter during a medical evacuation drill during at Artillery Relocation Training Program 23.2 at Combined Arms Training Center, Camp Fuji, Japan, July 13, 2023. ARTP provides Marines the opportunity to rehearse realistic scenarios across a range of climates and conditions, providing combat ready forces in the Indo-Pacific. The U.S. service members are with 3d Battalion, 12th Marines, 3d Marine Division. The JGSDF helicopter is with Eastern Army Helicopter, 2nd Aviation Unit. (U.S. Marine Corps photo by Lance Cpl. Evelyn Doherty)

MORE
ARTP 23.2: Medevac

U.S. Navy Corpsmen and Marines transport a simulated casualty onto a Japan Ground Self-Defense Force UH-1 helicopter during a medical evacuation drill during at Artillery Relocation Training Program 23.2 at Combined Arms Training Center, Camp Fuji, Japan, July 13, 2023. ARTP provides Marines the opportunity to rehearse realistic scenarios across a range of climates and conditions, providing combat ready forces in the Indo-Pacific. The U.S. service members are with 3d Battalion, 12th Marines, 3d Marine Division. The JGSDF helicopter is with Eastern Army Helicopter, 2nd Aviation Unit. (U.S. Marine Corps photo by Lance Cpl. Evelyn Doherty)

MORE
King of Battle

U.S. Marines with 3d Battalion, 12th Marines are tough, disciplined and combat ready forces who live up to artillery’s name as the “King of Battle." 3/12 is the only permanently forward-deployed artillery battalion in Okinawa, ready to respond to crisis in support of a free and open Indo-Pacific.

MORE
ARTP 23.2: Awards

U.S. Marines and Sailors receive awards at Combined Arms Training Center, Fuji, Japan, Aug. 2, 2023. These individuals with 3d Battalion, 12th Marines were awarded for their outstanding achievements during Artillery Relocation Training Program 23.2. (U.S. Marine Corps photo by Lance Cpl. Evelyn Doherty)

MORE
ARTP 23.2: HIMARS

U.S. Marine Corps Sgt. Autumn Becker operates a High Mobility Artillery Rocket System on a resupply mission during Artillery Relocation Training Program 23.2 at Combined Arms Training Center Camp Fuji, Japan, July 24, 2023. ARTP allows Marines to rehearse actions in a deployed environment to increase capabilities and problem-solving skills. Becker, a native of Douglassville, Pennsylvania, is a HIMARS Chief with 3d Battalion, 12th Marines, 3d Marine Division. (U.S. Marine Corps photo by Lance Cpl. Evelyn Doherty)

MORE

3d Battalion 12th Marines Leaders

Commanding Officer

Lieutenant Colonel Frank J. Mastromauro

Lieutenant Colonel Frank J. Mastromauro, who calls Barnstable, MA home, graduated from Boston University in 2006 and received his commission through the Officer Candidate Course in March 2008. Lieutenant Colonel Mastromauro reported to The Basic School in March and the Field Artillery Basic Course...

Read Biography

Official Photo

Sergeant Major

Sergeant Major Joshua J. Henderson

Sergeant Major Henderson was born on 23 August 1985 in Conroe, Texas. He enlisted in the Marine Corps in April 2004 and attended recruit training at Marine Corps Recruit Depot, San Diego, California. Upon completion of recruit training, he received training at Marine Combat Training School (MCT), at...

Read Biography

Official Photo

3d Battalion
12th Marine Littoral Regiment
Unit 36110
FPO, AP 96385-6110

Collapse All Expand All

S1 (Admin)

S-1 Adjutant

DSN: 315-623-7764

S-1 Chief
DSN: 315-623-7765

S2 (Intel)

S-2 Intel Officer

DSN: 315-623-4058

S-2 Chief
DSN: 315-623-4777

S3 (Ops)

Operations Officer

DSN: 315-623-7763

S3A
DSN: 315-623-1157

S3 Chief
DSN: 315-623-4213

S3 Training
DSN: 315-623-4796

S4 (Log)

S4 Officer

DSN: 315-623-4614

S4A
DSN: 315-623-7723

S4 Chief/Embark
DSN: 315-623-1690

Motor Transport Officer
DSN: 315-623-7188

Supply Officer
DSN: 315-623-4456

Medical Officer
DSN: 315-623-4188

S6 (Comm)

S6 Officer

DSN: 315-623-3456/1733

S6 Chief
DSN: 315-623-4605

Radio Chief
DSN: 315-623-7183

Wire Chief
DSN: 315-623-4294

Data Chief
DSN: 315-623-4294

EM Chief
DSN: 315-623-4284