U.S. Marine Corps Sgt. David Ricketts, squad leader for Alpha Company?s 2nd Platoon with 7th Engineer Support Battalion, Special Purpose Marine Air-Ground Task Force 7, shares his experience of participating in border support as a combat engineer at the California-Mexico border. U.S. Northern Command is providing military support to the Department of Homeland Security and U.S. Customs and Border Protection to secure the Southern border of the United States.