Members of the 90th Missile Wing (MW) at F.E. Warren Air Force Base (AFB), Wyo., pose for a group photo in front of a B-2 Spirit at Whiteman AFB, Mo., April 14, 2016. The 90th MW and the 509th and 131st Bomb Wings are participating in a “sister-base” partnership, officially named the Bomber Missile Exchange Course, which allows the organizations to learn from each other through scheduled visits.