, ▁ 1 8 E , ▁ 1 8 F , ▁and ▁ 1 8 Z ▁( less ▁Special ▁Forces ▁medical ▁ser ge ant ) ▁acc ru es ▁from ▁ 2 0 ▁December ▁ 1 9 8 9 . ▁ ▁Ret ro active ▁awards ▁of ▁the ▁C IB ▁to ▁Special ▁Forces ▁personnel ▁are ▁not ▁author ized ▁prior ▁to ▁ 2 0 ▁December ▁ 1 9 8 9 . ▁ ▁A ▁recip ient ▁must ▁be ▁personally ▁present ▁and ▁under ▁host ile ▁fire ▁while ▁serving ▁in ▁an ▁assigned ▁inf antry ▁or ▁Special ▁Forces ▁primary ▁duty , ▁in ▁a ▁unit ▁act ively ▁engaged ▁in ▁ground ▁combat ▁with ▁the ▁enemy . ▁ ▁The ▁unit ▁in ▁question ▁can ▁be ▁of ▁any ▁size ▁smaller ▁than ▁brig ade . ▁ ▁On ▁or ▁after ▁ 1 8 ▁September ▁ 2 0 0 1 : ▁a ▁soldier ▁must ▁be ▁an ▁Army ▁inf antry ▁or ▁special ▁forces ▁officer ▁( SS I ▁ 1 1 ▁or ▁ 1 8 ) ▁in ▁the ▁grade ▁of ▁Colonel ▁or ▁below , ▁or ▁an ▁Army ▁en list ed ▁soldier ▁or ▁war rant ▁officer ▁with ▁an ▁inf antry ▁or ▁special ▁forces ▁M OS , ▁who ▁has ▁satisf actor ily ▁performed ▁duty ▁while ▁assigned ▁or ▁attached ▁as ▁a ▁member ▁of ▁an ▁inf antry , ▁r anger ▁or ▁special ▁forces ▁unit ▁of ▁brig ade , ▁regiment al , ▁or ▁smaller ▁size ▁during ▁any ▁period ▁such ▁unit ▁was ▁engaged ▁in ▁active ▁ground ▁combat . ▁ ▁A ▁soldier ▁must ▁be ▁personally ▁present ▁and ▁under ▁fire ▁while ▁serving ▁in ▁an ▁assigned ▁inf antry ▁or