Col Brian W. Mullery enlisted in the United States Marine Corps in January 1983. He completed recruit training at Marine Corps Recruit Depot Parris Island, South Carolina and Infantry Training School at Camp Geiger, North Carolina. His enlisted assignments as an infantryman were with 3rd Battalion 2nd Marines, 1st Battalion 9th Marines, 3rd Light Armored Reconnaissance Battalion participating in Operations Desert Shield and Desert Storm, 1st Battalion 5th Marines, 3rd Battalion 5th Marines and 1st Surveillance Reconnaissance and Intelligence Group. Additionally, he served as a Marine Security Guard in Lisbon Portugal, Quito Ecuador, Leningrad USSR and Paris France as well as a Junior Drill Instructor, Senior Drill Instructor and Series Chief Drill Instructor at Marine Corps Recruit Depot, San Diego, California.
Selected for Gunnery Sergeant in 1996, he was commissioned through the Meritorious Commissioning Program in December of 1996. Upon completion of Officers Candidate Course, The Basic School and Logistics Officer School, Second Lieutenant Mullery reported to 11th Marines in July 1997 for duty as the Assistant Regimental Logistics Officer and Maintenance Management Officer. In July 2000 First Lieutenant Mullery reported to First Force Service Support Group and was assigned as the Staff Secretary. In May 2001 Captain Mullery was assigned as the Operations Officer for Marine Expeditionary Unit Service Support Group 11 deploying to the Western Pacific from May to December 2002. In early 2003 MSSG-11 was re-designated Combat Service Support Battalion 19 and Captain Mullery deployed as their Operations Officer in support of Operation Iraqi Freedom I from March to June 2003.
In July 2003, Captain Mullery reported to Expeditionary Warfare School and upon graduation was assigned to Region 7, Marine Corps Embassy Security Group as the Executive Officer responsible for Marine Security Guard Detachments throughout North and West Africa. In April 2007, Major Mullery assumed Command of Region 2, Marine Corps Embassy Security Group responsible for more than twenty Marine Security Guard Detachments throughout the Near East and South Asia. In July 2007, Major Mullery reported to Marine Corps Command and Staff College for academic year 2007-2008 earning a Masters of Military studies.
In July of 2008 Major Mullery reported to Second Marine Division for duty as the Sixth Marines Regimental Logistics Officer and deployed with Regimental Combat Team 6 in support of Operation Iraqi Freedom to Ramadi, Iraq from January to October 2009. Post-deployment, Major Mullery remained with Sixth Marines until December 2010 at which time he reported to the G-4 of Second Marine Division (Forward) as the Plans and Future Operations Officer. From February 2011 to February 2012 Major Mullery deployed with Second Marine Division (Forward) to Camp Leatherneck, Afghanistan in support of Operation Enduring Freedom.
LtCol Mullery commanded Combat Logistics Battalion 6 from June 2012 to June 2014, during that time he deployed to Camp Leatherneck, Afghanistan, providing logistical support to Regional Command Southwest from July 2013 to Feb 2014. LtCol Mullery attend the Naval War College, academic year 2014-2015 earning a Master of Arts, National Security and Strategic Studies. He served on the Joint Staff with the J-7 as Chief, Joint Doctrine Analysis Division from July 2015 to June 2018. Col Mullery was the Assistant Chief of Staff, G-4, Logistics to US Marine Corps Forces, Special Operations Command from June 2018 to June 2019. He assumed command of Combat Logistics Regiment 27 in June 2019. His personal decorations include the Legion of Merit, Bronze Star Medal, the Defense Meritorious Service Medal, the Meritorious Service Medal (fourth award), the Navy and Marine Corps Commendation Medal (second award), the Joint Service Achievement Medal, the Navy and Marine Corps Achievement Medal and the Combat Action Ribbon.