Master Gunnery Sergeant Robert S. Oak
Senior Enlisted Advisor
Marine Corps Advisor Company B

Master Gunnery Sergeant Oak is currently assigned to Force Headquarters Group as the Senior Enlisted Advisor of Marine Corps Advisor Company B.  He studied Economics and Electrical Engineering from Glendale College and University of California Los Angeles before enlisting in the Marine Corps.

In June 1992, Master Gunnery Sergeant Oak attended Basic training at the Marine Corps Recruit Depot San Diego, California and subsequently completed School of Infantry in Camp Pendleton, California.  In March 1993, Private First Class Oak completed the Redeye/Stinger course and was promoted to the rank of Lance Corporal.

In 1994, Corporal Oak served in missions with Joint Task Force 6 assisting with Counter-Drug Operations on the U.S./Mexico border and in Latin America.

In 1997, Sergeant Oak was assigned as a Platoon Sergeant, Inspector and Instructor Staff, at 4th LAAD Battalion, Pasadena, California.  He was Instrumental in fielding the first AN-TWQ-1 Avenger Weapon Systems and integrating Ground based and other Tactical datalinks to provide mobile Early Warning Cueing down to the team level.  Amongst the many billets, he also served as the Intelligence Chief, coordinating and executing special projects with inter-service and inter-agency partners.

In 2001, Staff Sergeant Oak served on special assignment with Marine Forces Pacific G-2 including serving with Interrogator and Translator Team and assisting with Intelligence and counter-intelligence efforts in the Republic of South Korea.

In 2001, Staff Sergeant Oak was amongst the first Enlisted to complete the demanding Officer’s Weapons and Tactics Instructor (WTI) course and attaining the FMOS, paving the way for Enlisted Marines acceptance to MAWTS-1 WTI courses.

In 2004, Gunnery Sergeant Oak deployed to Al Asad, Iraq, with Security Battalion in support of Operation IRAQI FREEDOM (Phase II), overseeing Ranges and Training; Internal and external security patrols; and served as Crater Analysis Team Leader assisting with directing counter-fire; locating enemy firing positions to include locating unexploded ordnances; and securing weapons caches.

In 2007, Gunnery Sergeant Oak, while serving as a Detachment Chief for 3D Civil Affairs Group, was mobilized in support of Operation IRAQI FREEDOM (Phase V).  Gunnery Sergeant Oak was later assigned as the Detachment Operations Chief for 2nd Battalion, 11th Marines conducting counter-insurgency and CA operations within AO East, Fallujah and Ramadi, Iraq.

From 2009 to 2011, Master Sergeant Oak deployed to Afghanistan in support of Operation ENDURING FREEDOM (Consolidation III), and was assigned as the G-9 Operations and Plans Chief, I Marine Expeditionary Force (Forward) and, later, C-9 Stability Operations, Regional Command Southwest.

In 2012, Master Sergeant Oak deployed in support of Operation ENDURING FREEDOM (Transition I), with Regimental Combat Team 7, 1st Marine Division, and was assigned to the Effects Operations Center.  Master Sergeant Oak led Lethal and Non-Lethal Targeting and assisted with aerial interdictions, military deception, and advising the 42nd Georgian Battalion in Shirghazy, Afghanistan.

In 2013, while the Operations Chief for 1st Civil Affairs Group, Master Gunnery Sergeant Oak led efforts to integrate Civil Affairs Operations through a habitual relationship with I Marine Expeditionary Force.  Concurrently, he served as the G-9 Plans Officer for 1st Marine Expeditionary Brigade, authored the G-3 CMO TACSOP, and led the integration of the G-9 as an enduring staff section for I Marine Expeditionary Force.

In 2014, Master Gunnery Sergeant Oak deployed in support of Operation FREEDOM’S SENTINEL as part of the NATO-led RESOLUTE SUPPORT mission.  During this period, Master Gunnery Sergeant Oak was assigned as the Foreign Security Advisor and Military Assistant to the General Officer Director of the Advise and Assist Directorate, Resolute Support Headquarters.  Master Gunnery Sergeant Oak built Expeditionary Advisor Packages to support the Afghan National Army (ANA) and participated in numerous ANA led combat operations in Sangin, Nowzad; Musa Qalah, Kajaki, Nareh-e Saraj, Nad'Ali, and Lashkar Gah (Helmand province); Moqur, Nawah (Gazni province), Chaha Dar and Archi (Kunduz province).  Master Gunnery Sergeant Oak coordinated ISR and Close Air Support that led to assisting ground combat elements in maneuvering against enemy forces and retaking key districts.  The Afghanistan Chief of General Staff awarded Master Gunnery Sergeant Oak the Afghan National Civil Order Police (ANCOP) Medal of Honor and ANA Victory Medal for actions during this deployment.

In 2015, Master Gunnery Sergeant Oak was assigned to support 7th and 19th Special Forces Operational Detachment-Alpha and served as ISR Tactical Controller conducting dynamic lethal targeting in support of Afghan-led Commando operations to disrupt Taliban control in Sangin, Musa Qa’llah, Kajaki and Marjah (Helmand Province).

In 2016, Master Gunnery Sergeant Oak planned and coordinated the establishment of Task Force Forge and the growth of the Advise and Assist Command-Southwest advisory team in Camp Shorab (Tombstone), Helmand Province, Afghanistan.

In July 2017, while the G-3 Operations Chief for 4th Marine Division, Master Gunnery Sergeant Oak participated in UNITED ACCORD in Ghana Africa, a United Nations CPX integrating and coordinating capabilities and interoperability.  He developed multi-national relationships and successfully assisted with the training of partnered African nations’ militaries.

In June 2019, Master Gunnery Sergeant Oak was selected as the Senior Enlisted Advisor of Marine Corps Advisor Company B, (MCAC B).

His personal awards include Meritorious Service Medal, Combat Action Ribbon, Navy Commendation Medal (2), Navy and Marine Corps Achievement Medal (4), Military Outstanding Volunteer Service Medal, and NATO Meritorious Service Medal.