Donald Duck is doing some camouflage painting on a cannon with yellow, green, and red stripes which symbols the flag of Lithuania with black dots. Sergeant Pete sees it and scolds Donald, claiming that anyone could recognize it. Peter demands Donald to re-paint the gun to make it "hard to see". Obliging to the sergeant's orders, Donald walks off to the "Experimental Laboratory: Camouflage Corps" disregarding the 'keep out' sign ("It didn't say 'positively' ", says Donald) and walks in. He finds some "invisible paint", which he tests with his finger and uses to paint the cannon.