Parents need to know that Hacksaw Ridge is based on the true story of Desmond Doss ( Andrew Garfield) , a pacifist who enlisted in World War II but refused to carry a weapon or kill, preferring to save wounded men as a medic. Director Mel Gibson doesn't shy away from showing extremely graphic war violence. Bullets pierce flesh in slow motion, explosions toss men in the air, bleeding leg and arm stumps are shown, throats are slashed, soldiers bayonet each other to death, and men are graphically gutted, disembodied, and beheaded, with entrails and ligaments left hanging. Doss is also beaten by his fellow soldiers during basic training due to his refusal to carry a weapon. And his superior officers jail and put him on trial. Doss kisses and marries a nurse; they're seen ( him shirtless, her clothed) on their wedding night. Doss' father is an abusive alcoholic. Adults smoke cigarettes and use and the racist terms Japs and Nips. Ultimately, though the movie's message is one of courage, integrity, and sticking to your convictions.