LtCol Gallman attended Tuskegee University in Tuskegee, AL and received a Bachelor of Science in Aerospace Engineering in 1992. Via the Marine Officer Candidate Course (OCC), he was commissioned in Dec 1994.
Upon completion of The Basic School (TBS) in Jul 1995, LtCol Gallman underwent Naval Aviation training in Pensacola, FL and Corpus Christi, TX and was designated a Naval Aviator in Nov 1997. He was assigned to Marine Helicopter Training Squadron 204 (HMT-204) aboard Marine Corps Air Station (MCAS) New River in Jacksonville, NC for CH-46E fleet replacement training.
In Jan 1998, LtCol Gallman reported to Marine Medium Helicopter Squadron 166 (HMM-166) of Marine Aircraft Group Sixteen (MAG-16) aboard MCAS El Toro in El Toro, CA. In 1999, he moved with HMM-166 to MCAS Miramar in San Diego, CA. During the five year tour at HMM-166, he completed two Western Pacific deployments and served as schedule writer, Pilot Training Officer, Weapons and Tactics Instructor (WTI) and Assistant Operations Officer.
In 2002, LtCol Gallman was assigned to the MAG-16 operational staff. He served in future plans as the CH-46E WTI during the initial invasion in support of Operation Iraqi Freedom (OIF) 2003.
In Jul 2003, LtCol Gallman reported to Marine Aviation Weapons and Tactics Squadron One (MAWTS-1) aboard MCAS Yuma in Yuma, AZ. His primary duties were as a tactics instructor in the CH-46E helicopter division. In the summer of 2005, LtCol Gallman moved to Nellis Air Force Base in Las Vegas, NV. Still serving as a MAWTS-1 instructor, he also acted as the Marine Corps Liaison Officer for production and the Volume Manager of all Marine Corps aviation tactical manuals.
LtCol Gallman was selected for Intermediate Level School (ILS) and moved to Newport, RI in Aug 2007. He attended the United States Naval War College and earned a Masters Degree in National Security and Strategic Studies.
LtCol Gallman reported back to MAG-16, Marine Medium Helicopter Squadron 161 (HMM-161) where he served as the Operations Officer from Jul 2008 to Oct 2009. During the tour, LtCol Gallman deployed with the squadron to Iraq in support of OIF 08.02 and transitioned HMM-161 to Marine Medium Tiltrotor Squadron 161 (VMM-161), the first West Coast VMM squadron.
In Oct 2009, LtCol Gallman moved to 3rd Marine Aircraft Wing (MAW) Headquarters. He served as an action Officer on the 3d MAW Transition Task Force (TTF) responsible for all Type Model Series (TMS) aircraft transitions within 3d MAW.
In Jul 2010, LtCol Gallman executed orders to Headquarters Marine Corps Department of Aviation in Arlington, VA. He served in the Aviation Plans and Programs (APP) Branch as the Aviation Training Systems (ATS) Lead and APP-3 Division Head. During the tour, LtCol Gallman was selected for VMM squadron Command and reported to Marine Aircraft Group Twenty-Six (MAG-26) at Marine Corps Air Station New River for MV-22 transition training. After completing training, LtCol Gallman served as the MAG-26 Personnel Support Detachment (PSD) Commanding Officer from Feb 2012 to Jun 2013.
In June 2013 LtCol Gallman assumed squadron command of VMM-261. During this command tour he led the squadron in support of combat operations in Operation ENDURING FREEDOM 14.1 and Operation INHERENT RESOLVE.
After relinquishing command in 2015 LtCol Gallman was selected to attend Top Level School (TLS) at the National War College in Washington, DC where he received a Master’s Degree in National Security Strategy. In June, 2016, LtCol Gallman assumed his present duties at Marine Corps Base Quantico as the Executive Officer of The Basic School.
LtCol Gallman has flown over 3,200 flight hours and his personal decorations include the Bronze Star, Air Medal (with the numeral 5 and “V” device), the Navy and Marine Corps Commendation Medal (with 4 Gold Stars in lieu of 5th award) and the Navy Achievement Medal.