It's actually a decoy target on the helmet, their heads have evolved to be much flatter at the top due to less brainpower usage requiring less space in the cranium.

The art is good, it feels like alot of filler, i agree with more feeling to be desired. The comic is theme around the whole "war can be boring" so i imagine it's more themed for stuff like generation kill, casual boring day to day shit during a war - but eh.

i found the one where the dude dropping a rock on a blue soldier way back when funny when i was younger. it's a certain type of humour, wasn't so amusing to me rereading it now.