In the 18 months between September 2001 and April 2003, DISA supported the exponential use and increased capacity of information systems. The Defense Switched Network (DSN) infrastructure increased 400 percent. The Secret Internet Protocol (IP) Data Service (formerly known as the SIPRNet) capacity increased 292 percent. Sensitive but Unclassified Internet Protocol (IP) Data Service (formerly known as NIPRNet) capacity increased 509 percent. The Defense Video System Global (Secure) increased 1,150 percent. Satellite bandwidth increased 800 percent. The Enhanced Mobile Satellite Service (EMSS) capacity increased 300 percent, and usage increased 3,000 percent. EMSS allowed Special Operations forces to even call in air strikes from horseback in Afghanistan by permitting instantaneous communications in areas without any infrastructure whatsoever.