Final answer:
Lt. Jimmy Cross received a good-luck four-leaf clover from Martha in 'The Things They Carried'. This reflects his emotional connection to her and underscores the personal items soldiers carried for comfort.
Step-by-step explanation:
In Tim O'Brien's short story The Things They Carried, the character who received a good-luck four-leaf clover from Martha was Lt. Jimmy Cross. This detail is significant as it provides insight into Lt. Cross's emotional state and the things he holds dear during the Vietnam War, illustrating the personal burdens and talismans that soldiers carry along with their military gear. Lt. Cross is the platoon leader who is preoccupied with thoughts of Martha, a woman he left back home, which affects his ability to lead his men effectively.