USA-128, also known as GPS IIA-18, GPS II-27 and GPS SVN-30, is an American navigation satellite which forms part of the Global Positioning System.
 It was the eighteenth of nineteen Block IIA GPS satellites to be launched.
USA-117, also known as GPS IIA-16, GPS II-25 and GPS SVN-33, is an American navigation satellite which forms part of the Global Positioning System.
 It was the sixteenth of nineteen Block IIA GPS satellites to be launched.
The Global Positioning System (GPS), originally Navstar GPS, is a space-based radionavigation system owned by the United States government and operated by the United States Air Force.
 It is a global navigation satellite system that provides geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites.
USA-135, also known as GPS IIA-19, GPS II-28 and GPS SVN-38, is an American navigation satellite which forms part of the Global Positioning System.
 It was the last of nineteen Block IIA GPS satellites to be launched.
USA-87, also known as GPS IIA-8, GPS II-17 and GPS SVN-29, was an American navigation satellite which formed part of the Global Positioning System.
 It was the eighth of nineteen Block IIA GPS satellites to be launched.
USA-94, also known as GPS IIA-13, GPS II-22 and GPS SVN-35, was an American navigation satellite which formed part of the Global Positioning System.
 It was the thirteenth of nineteen Block IIA GPS satellites to be launched.
USA-92, also known as GPS IIA-12, GPS II-21, GPS SVN-39, and NAVSTAR 39, is an American navigation satellite which forms part of the Global Positioning System.
 It was the twelfth of nineteen Block IIA GPS satellites to be launched.
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-96, also known as GPS IIA-14, GPS II-23 and GPS SVN-34, was an American navigation satellite which formed part of the Global Positioning System.
 It was the fourteenth of nineteen Block IIA GPS satellites to be launched.
USA-100, also known as GPS IIA-15, GPS II-24 and GPS SVN-36, is an American navigation satellite which forms part of the Global Positioning System.
 It was the fifteenth of nineteen Block IIA GPS satellites to be launched.

Question: What was the 17th of the 19th block IIA satellites to be launched under the radio-navigation formerly known as "Navatstar"?
Answer: USA-126