Focus on Takka Takka (Lichtenstein) and discuss the Background.
Lichtenstein was a trained United States Army pilot, draftsman and artist as well as a World War II (WWII) veteran who never saw active combat. The work depicts a machine gun firing as it is situated above the camouflage of palm fronds during the Battle of Guadalcanal.  The image shows shell casings and a grenade in mid flight. An explosion is stylized with the titular phrase. The source of Takka Takka is the comic book Battlefield Action #40 (February 1962, Charlton Comics Group).Lichtenstein's reinterpretation of the original comic image eliminates the horizon line and other indications of depth of field. He also eliminates the human element by removing a hand, a helmet and the Japanese rising sun emblem.
When the characters in some of his works, e.g. Takka Takka, Whaam! and Okay Hot-Shot, Okay!, were criticised for being militaristic, Lichtenstein responded: "the heroes depicted in comic books are fascist types, but I don't take them seriously in these paintings—maybe there is a point in not taking them seriously, a political point. I use them for purely formal reasons."
depth of field comic book grenade camouflage palm frond horizon United States Army Battle of Guadalcanal Okay Hot-Shot, Okay! shell casing Whaam! World War II machine gun