Sergeant Major Roosa completed recruit training earning a Meritorious Promotion at Marine Corps Recruit Depot, Parris Island, S.C., in October 1988. He subsequently reported to Courthouse Bay, Camp Lejeune, North Carolina for MOS training. Upon completion of MOS training, he reported to H&S Company, 4th Combat Engineer Battalion as an MOS 1141, Basic Electrician.
In May 1989, then Lance Corporal Roosa, initiated a lateral move and transferred to Company C, 4th Combat Engineer Battalion in Lynchburg, Virginia. During the summer of 1990 he returned to Courthouse Bay, Camp Lejeune, North Carolina and completed the Basic Combat Engineer course earning the MOS, 1371 Combat Engineer.
In January 1991, Lance Corporal Roosa was mobilized in support of Operation Desert Storm with Company C, 4th CEB, augmenting 2nd CEB, Camp Lejeune, North Carolina. He participated in training exercises until the unit demobilized in April, 1991 returning to Lynchburg, Virginia where he remained with Company C. In 1998, he was promoted to Staff Sergeant and attended the Career Course at Camp Crowder, Missouri. During his time with Company C, 4th CEB, he served in billets from Fire Team Leader through Platoon Commander, in addition to billets as the Company Gunnery Sergeant and Company First Sergeant. He participated in multiple Combined Arms Exercises, Amphibious Operations Training Exercises, Cold Weather Training, and deployments to the Former Yugoslav Republic of Macedonia and Romania.
During 2004, Staff Sergeant Roosa transferred to H&S Company, 4th CEB, and served as the Company Gunnery Sergeant. In 2004, he mobilized with Company C in support of Operation Iraqi Freedom leading a Combat Engineer platoon attached to 2nd Battalion, 24th Marines. He was promoted to Gunnery Sergeant in August, 2004, prior to deploying to Iraq. Gunnery Sergeant Roosa participated in Combat Operations in the South Babil Province.
In April 2005, Gunnery Sergeant Roosa demobilized from Company C and returned to H&S Company, 4th CEB. He subsequently transferred to the IMA Detachment, III MEF, Camp Courtney, Okinawa, Japan as the III MEF Engineer Chief. Between 2005 and 2008, he deployed to South Korea in support of III MEF Operations to include RSOI & UFL.
In 2008, he was selected and promoted to First Sergeant reporting to H&S Company, 4th Supply Battalion. He served independently as the principal senior enlisted advisor preparing Marines for multiple deployments in support of Operations Iraqi Freedom and Enduring Freedom.
Upon his selection for promotion, he received orders in May 2012, as the Sergeant Major for 4th Air Naval Gunfire Liaison Company, Force Headquarters Group, West Palm Beach, Florida. During March of 2013, Sergeant Major Roosa completed the U.S. Army Airborne School earning his Basic Parachutist Wings.
Sergeant Major Roosa holds a Bachelor’s of Science degree in Business Administration from Longwood University. He also holds a certification in ITIL Service Management Foundations.
His personal awards include the Meritorious Service Medal, two Navy and Marine Corps Commendation Medals, the Navy Achievement Medal, two Certificates of Commendation, and two Letters of Appreciation.