Rockwell/Boeing should be proud: One of the first Block IIA GPS satellite SVN-23 celebrates 23 years on orbit

The Air Force got their moneys worth with this one.

GPS space segment
Block IIA is an upgraded version of the GPS Block II satellites launched in 1989-1990. The "II" refers to the second generation of GPS satellites, although Block II was actually the first series of operational GPS satellites. The "A" stands for advanced.

Developed by Rockwell International (now Boeing), the IIA series production comprised a total of 19 satellites: Space Vehicle Number (SVN) 22 through SVN-40. The first IIA was launched in November 1990, and the last launch occurred in November 1997. As of October 2013, there were 8 Block IIA satellites remaining in the GPS constellation, far exceeding the 7.5-year design lifespan.
Science and Technology: GPS satellite approaching 23 years on orbit

"We've reached a point in space operations, much like in the flying community, that our satellites are sometimes older than their operators," said Lt. Col. Thomas Ste. Marie, 2 SOPS commander. "I was a member of 2 SOPS as a second lieutenant when this satellite flew past its design life in 1998. It's simply amazing that a vehicle designed to last seven and half years has made it to its 23rd birthday. It is a credit to the operators, analysts, maintainers and engineers on both the government and contractor sides who all worked to diligently to preserve its mission capabilities."