Best Friends I was initially assigned to DIA at Arlington Hall, VA for about 1 month. Then BG H. P. Smith directed that a Photo Interpretation shop be setup in the Pentagon to support the Analysts there and to support current Intelligence and the Joint Staff. I was put in charge of this unit as a Major and later promoted to Lt. Col. The DIA unit designation was DIA/DB5F, but we were fondly refered to as "F Troop"