Army Regulation 12-1: Security Assistance and International Logistics: Security Assistance, Training, and Export Policy [July 23, 2010] [open pdf - 1MB]
"This regulation establishes Army policy and prescribes responsibilities and procedures for the planning, integration, programming, budgeting, and execution of Army security assistance sales, financing, manpower, training, and logistics. It also establishes Army export policy. This regulation authorizes the publication of an Army pamphlet which, in conjunction with this regulation, ensures that the Army's security assistance efforts are integrated and support guidance from higher authorities."
Army Regulation 12-1; AR 12-1
United States Army: http://www.army.mil/