▁cases ▁in ▁athlet ics ▁ ▁References ▁ ▁External ▁links ▁ ▁Category : L iving ▁people ▁Category : 1 9 8 9 ▁birth s ▁Category : I ran ian ▁male ▁spr inter s ▁Category : D op ing ▁cases ▁in ▁athlet ics ▁Category : I ran ian ▁sports people ▁in ▁do ping ▁cases ▁Category : A th let es ▁( track ▁and ▁field ) ▁at ▁the ▁ 2 0 1 4 ▁Asian ▁Games ▁Category : As ian ▁Games ▁compet itors ▁for ▁Iran <0x0A> </s> ▁In ▁tele communic ation , ▁a ▁combat - net ▁radio ▁( CN R ) ▁is ▁a ▁radio ▁operating ▁in ▁a ▁network ▁that ▁( a ) ▁provides ▁a ▁half - du plex ▁circuit ▁and ▁( b ) ▁uses ▁either ▁a ▁single ▁radio ▁frequency ▁or ▁a ▁discrete ▁set ▁of ▁radio ▁frequencies ▁when ▁in ▁a ▁frequency ▁ho pping ▁mode . ▁ ▁C NR s ▁are ▁primarily ▁used ▁for ▁push - to - t alk - oper ated ▁radio ▁n ets ▁for ▁command ▁and ▁control ▁of ▁combat , ▁combat ▁support , ▁and ▁combat ▁service ▁support ▁operations ▁among ▁military ▁ground , ▁sea , ▁and ▁air ▁forces . ▁ ▁In ▁the ▁United ▁States , ▁two ▁military ▁standards ▁govern ▁the ▁use ▁of ▁combat ▁net ▁rad ios ▁and ▁the ▁host ▁applications ▁that ▁communicate ▁over ▁the ▁network : ▁M IL - ST D - 1 8 8 - 2 2 0 ▁and ▁M IL - ST D - 2 0 4 5 - 4 7 0 0 1 . ▁In ▁addition ▁to ▁I ET F ▁R FC s ▁gover