av_nrol42_r7924201725643AM63.jpgav_nrol42_r7924201725643AM63.jpg

Image  KB  9/24/2017

The Mobile Service Tower or MST is rolled back at Vandenberg Air Force Base's Space Launch Complex-3 in preparation for the launch of a United Launch Alliance Atlas V rocket carrying the NROL-42 mission. United Launch Alliance/Jeff Spotts