Astronaut Barry "Butch" Wilmore announced his retirement Wednesday after 25 years with NASA and serving as a U.S. Navy test pilot before becoming an astronaut.

Astronaut Barry "Butch" Wilmore announced his retirement Wednesday after 25 years with NASA and serving as a U.S. Navy test pilot before becoming an astronaut.

The astronaut ends a 25-year career after his last mission saw him spend much longer than expected on the ISS.