Coast Guard during World War II. Coast Guard Squadron One, was a combat unit formed by the United States Coast Guard in 1965 for service during the Vietnam War. Placed under the operational control of the United States Navy, it was assigned duties in Operation Market Time. Its formation marked the first time since World War II that Coast Guard personnel were used extensively in a combat environment. The squadron operated divisions in three separate areas during the period of 1965 to 1970. Twenty-six Point-class cutters with their crews and a squadron support staff were assigned to the U.S. Navy with the mission of interdicting the movement of arms and supplies from the South China Sea into South Vietnam by Viet Cong and North Vietnam junk and trawler operators. The squadron also provided 81mm mortar naval gunfire support to nearby friendly units operating along the South Vietnamese coastline and assisted the U.S. Navy during Operation Sealords. Coast Guard Squadron Three, was a combat unit formed by the United States Coast Guard in 1967 for service during the Vietnam War. Placed under the operational control of the United States Navy and based in Pearl Harbor. It consisted of five USCG High Endurance Cutters operating on revolving six-month deployments. A total of 35 High Endurance Cutters took part in operations from May 1967 to December 1971, most notably using their 5-inch guns to provide naval gunfire support missions. Often units within the Coast Guard operate under Department of the Navy operational control while other Coast Guard units remain under the Department of Homeland Security. Deployable Operations Group The Deployable Operations Group (DOG) was a Coast Guard command established in July 2007. The DOG established a single command authority to rapidly provide the Coast Guard, Department of Homeland Security, Department of Defense, Department of Justice and other interagency operational commanders adaptive force packages drawn from the Coast Guard's deployable specialized force units. The DOG was disestablished on 22 April 2013 and its deployable specialized forces (DSF) units were placed under the control of the Atlantic and Pacific Area Commanders. The planning for the unit began after the terrorist attacks of 11 September 2001, and culminated with its formation on 20 July 2007. Its missions included maritime law enforcement, anti-terrorism, port security, pollution response, and diving operations. There were over 25 specialized units within the Deployable Operations Group including the Maritime Security Response Team,