The Air Force Special Operations Command (AFSOC) purchased an initial supply of over 3,000 iPad-based EFBs which were launched in December 2011.[13] In a similar acquisition, Air Mobility Command initiated a contract for up to 18,000 iPad-based EFBs.[14] The Air Force Special Operations Command internally developed a secure method of transferring the National Geo-Spatial Intelligence Agency's (NGA) monthly Flight Information Publications (FLIP) dataset to all its users worldwide.