Under Heavy Fire (2001)

USMC Captain Ramsey is part of a group of US veterans invited, with war victim's son Brad Jordan, by the Vietnam government to revisit their battlegrounds now that international relations are friendly in the post-Cold War age. Initially he refuses to face his unit's darkest, most traumatic memory, but he accepts after an affair with a guide. The violent past is slowly reconstructed through site-stimulated flashbacks and finds a way to catch up and spark another drama.