The Private Snafu series was designed to instruct military behavior, particularly the clumsiness of soldiers and how to avoid it. We see instances of Snafu’s gun jamming because of mud, his cannon being dusty, and gun overheating, leading to him losing all situations.
They convey this in the movements of Snafu moving more confident before he realizes his weapon is messed up, which then switches his movement to more sporadic and frantic as he clamors to find a new weapon to save himself