Rubuta ci gaba ga wannan sakin layi - A lokacin da ya yi ritaya, Gehman ya yi aiki a matsayin shugaban kwamitin binciken hatsarin Columbia, co-shugaban, tare da janar William W. Crouch, na Hukumar Cole ta Ma'aikatar Tsaro
, a kan Kwamitin Sake Gyara da Rufewa (BRAC), kuma Babban Malami ne na Cibiyar Kula da Tsaro ta Kasa.