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"I can't tell if he's friendly or not"
"Well if he keeps coming I'm going to give it to him..."
Old WWII adage:
If a unit is advancing on your position and you can't recognize them; fire a single shot over their heads.
If you receive a fusillade of very accurate rifle fire ....then they're British.
If you receive a furious outpouring of automatic fire ...then they're German.
If the unit withdraws out of sight, and then your position is obliterated by artillery ....then they're Americans.
And on the German side: RAF planes are blue, American planes are silver, Luftwaffe planes are invisible :)
That reminds me of the observation that Marines solve their problems with the bayonet. The Army prefers High Explosives.