The only time I think it's lame when the Germans camp is when there's one German and one American left. Everyone is stuck waiting to play again meanwhile, the German has no idea where the other guy is and could just sit there for the remaining time. Go out and find the one remaining American so everyone else can play!
In other situations as described above, it's perfectly acceptable for the German's to camp/do their job.
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The only time you should start worrying about a soldier is when they stop bitchin'.