t ▁or ▁magazine ▁fed , ▁may ▁include ▁a ▁small ▁amount ▁of ▁trac er ▁am mun ition ▁( us ually ▁ 5 % ▁or ▁less ) ▁in ▁with ▁regular ▁m un itions , ▁to ▁facil itate ▁the ▁process ▁under ▁low - light ▁conditions . ▁ ▁The ▁main ▁role ▁of ▁an ▁art illery ▁observer ▁is ▁to ▁assist ▁friendly ▁art illery ▁in ▁accur ately ▁attack ing ▁a ▁target . ▁The ▁observer ▁will ▁communicate ▁instructions ▁to ▁the ▁friendly ▁forces ▁to ▁adjust ▁their ▁fire , ▁" walk ing " ▁it ▁onto ▁the ▁target . ▁Similarly , ▁a ▁forward ▁air ▁controller ▁will ▁help ▁friendly ▁air ▁units ▁adjust ▁their ▁aim ▁in ▁subsequent ▁a irst rik es . ▁▁ ▁The ▁name ▁results ▁from ▁the ▁fact ▁that ▁the ▁sequence ▁of ▁r ounds ▁striking ▁near ▁the ▁target ▁appear ▁to ▁be ▁walking ▁toward ▁the ▁target . ▁It ▁contrast s ▁with ▁the ▁aim ed ▁sh ots ▁of ▁semi - autom atic ▁( or ▁b olt ▁action , ▁single - shot , ▁etc .) ▁fire , ▁in ▁which ▁the ▁first ▁shot ▁is ▁placed ▁on ▁target ▁through ▁the ▁use ▁of ▁a ▁target ing ▁device , ▁which ▁may ▁be ▁as ▁simple ▁as ▁iron ▁s ights , ▁or ▁as ▁s oph istic ated ▁as ▁smart - b omb ▁technology . ▁ ▁References ▁ ▁Category : We ap on ▁operation <0x0A> </s> ▁C ress y - O men court ▁is ▁a ▁commune ▁in ▁the ▁Som me ▁department ▁in ▁Haut s - de - France ▁in ▁northern ▁France . ▁ ▁Geography ▁C ress y - O men court ▁is ▁situated ▁on