Snafuperman

This time, Pvt. Snafu gets tired of reading manuals ("Don't conk the enemy over the head with a book! Pump 'im full of lead!"), and gets to be Superman. His immediate conviction of infallibility and omnipotence may be a metaphor for any superpower's wartime elephantiasis; he embodies the belligerent all-brawn-and-no-brain mentality that takes over. Certainly in "Snafuperman", Snafu learns the hard way that it pays to read the manuals. Of course, he has help from voice artist Mel Blanc and director Frank Tashlin. Worth seeing.

As for that line "Messerschmitts! A whole mess of Messerschmitts!", that line also appeared in the Daffy Duck vehicle "Daffy - The Commando", in which Daffy ribs a Nazi Kommandant.