Congressional Research Service. July 25, 2012. 

Major U.S. arms sales and grants to Pakistan since 2001 have included items useful for counterterrorism and counterinsurgency operations, along with a number of “big ticket”platforms more suited to conventional warfare. In dollar value terms, the bulk of purchases have been made with Pakistani national funds, but U.S. grants have eclipsed these in recent years. 

http://fpc.state.gov/documents/organization/196190.pdf [PDF format, 1 page].