Lansdale was chosen due to his experience with counter-insurgency in the Philippines during the Hukbalahap Rebellion, as well as because of his experience supporting Vietnam's Diem regime. Samuel Halpern, a CIA co-organizer, conveyed the breadth of involvement: "CIA and the US Army and military forces and Department of Commerce, and Immigration, Treasury, God knows who else – everybody was in Mongoose. It was a government-wide operation run out of Bobby Kennedy's office with Ed Lansdale as the mastermind."[33]