Sgt. Maj. Abel Leal currently serves as the Headquarters Battalion Sergeant Major, taking the responsibility in October 2013. He served as a drill instructor from 2004 to 2007 aboard Marine Corps Recruit Depot San Diego, Calif. - Sgt. Maj. Abel Leal currently serves as the Headquarters Battalion Sergeant Major, taking the responsibility in October 2013. He served as a drill instructor from 2004 to 2007 aboard Marine Corps Recruit Depot San Diego, Calif.