Final answer:
The chronological order of Tim O'Brien's Vietnam War publications is 'If I Die in a Combat Zone, Box Me Up and Ship Me Home' (1973), 'Going After Cacciato' (1978), followed by 'The Things They Carried' (1990).
Step-by-step explanation:
The question asks for the chronological order of Tim O'Brien's publications about the Vietnam War. Tim O'Brien is an American author who served in the Vietnam War and later wrote several books related to his experiences. Among his notable works is 'The Things They Carried', published in 1990, which is a collection of linked short stories about a platoon of American soldiers fighting on the ground in the Vietnam War.
The stories are semi-autobiographical, with O'Brien including himself as a character named "Tim O'Brien." While 'The Things They Carried' is often the most discussed, O'Brien has several other publications on the subject of Vietnam War including 'If I Die in a Combat Zone, Box Me Up and Ship Me Home' (1973) and 'Going After Cacciato' (1978), which precede 'The Things They Carried'.