Lieutenant Sidney Martin is the proud, arrogant commander who leads Paul Berlin’s squad at the beginning of the novel. Martin quickly alienates his troops by demanding that they “clear” all Vietcong tunnels before throwing grenades into them—a strategy that results in the deaths of many of Martin’s troops, including Bernie Lynn and Frenchie Tucker. Although O’Brien never says so explicitly, it’s strongly suggested that Martin’s own soldiers, led by Oscar Johnson, agree to kill Martin with a grenade, reasoning that they’ll be safer with another lieutenant.