USA-126, also known as GPS IIA-17, GPS II-26 and GPS SVN-40, is an American navigation satellite which forms part of the Global Positioning System. It was the seventeenth of nineteen Block IIA GPS satellites to be launched. USA-126 was launched at 00:50:00 UTC on 16 July 1996, atop a Delta II carrier rocket, flight number D237, flying in the 7925-9.5 configuration. The launch took place from Launch Complex 17A at the Cape Canaveral Air Force Station, and placed USA-126 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.