▁director ▁for ▁concepts ▁and ▁oper ational ▁read iness , ▁Def ense ▁Communic ations ▁Pl anning ▁Group , ▁Washington , ▁D . C ., ▁and ▁in ▁June ▁ 1 9 6 9 ▁he ▁assumed ▁duties ▁as ▁the ▁deput y ▁director . ▁ ▁In ▁February ▁ 1 9 7 0 , ▁General ▁Evans ▁was ▁assigned ▁to ▁Head quarters ▁United ▁States ▁Air ▁Force , ▁Washington ▁D . C ., ▁as ▁special ▁assistant ▁for ▁sensor ▁explo itation , ▁a ▁newly ▁created ▁office . ▁He ▁was ▁transferred ▁in ▁April ▁ 1 9 7 1 ▁to ▁the ▁Office ▁of ▁the ▁Deput y ▁Chief ▁of ▁Staff , ▁Research ▁and ▁Development , ▁as ▁director ▁of ▁oper ational ▁requirements ▁and ▁development ▁plans , ▁and ▁in ▁September ▁ 1 9 7 1 ▁he ▁became ▁director ▁of ▁development ▁and ▁ac quis itions . ▁In ▁April ▁ 1 9 7 2 , ▁Evans ▁became ▁assistant ▁deput y ▁chief ▁of ▁staff , ▁research ▁and ▁development , ▁and ▁in ▁August ▁ 1 9 7 3 ▁he ▁was ▁appointed ▁deput y ▁chief ▁of ▁staff , ▁research ▁and ▁development . ▁ ▁General ▁Evans ▁became ▁commander ▁of ▁the ▁Air ▁Force ▁Systems ▁Command , ▁Andrew s ▁Air ▁Force ▁Base , ▁Maryland , ▁in ▁August ▁ 1 9 7 5 . ▁He ▁assumed ▁his ▁present ▁duties ▁as ▁commander , ▁Al lied ▁Air ▁Forces ▁Central ▁Europe ▁and ▁commander ▁in ▁chief , ▁United ▁States ▁Air ▁Forces ▁in ▁Europe ▁on ▁July ▁ 2 9 , ▁ 1 9 7 7 . ▁ ▁He ▁is ▁a ▁command ▁pilot ▁with ▁more ▁than ▁ 6 , 2 0