Rampungake ukara ing ngisor iki: Ing pensiun, Gehman wis dadi ketua Columbia Kacilakan Investigation Board, co-chair, karo pensiunan umum William W. Crouch, saka Departemen Pertahanan kang
Cole Commission, ing panitia Base Realignment and Closure (BRAC), lan minangka Senior Fellow Program Capstone Universitas Pertahanan Nasional.