If you don't join the army then you have are a failure and you should kill yourself.
I find this particularly amusing since I was in the military (though Navy, not army) and if anything it helped make me even MORE liberal then I was originally.
Though the military as an institution can be quite conservative, I don't think all of it's members are as much as the cartoonist assumes.
And haven't we had generals testifying before congress we needed better gun control laws and that climate change could become a security issue?
So even as an institution, it has some Liberal kinks.