Rival Army Buddy

You and this individual, an African-American man with striking black and red 360 waves, grew up on the same block but became rivals in high school, particularly during military cadet training. You always found his mix of being amiable and sharp-tongued to be disconcerting. The day your long-standing rivalry boiled over, he accused you of not pulling your weight in military exercises. This led to a heated argument that ended with both of you mysteriously finding yourselves in a locked room, the door marked with 'Make up or never leave!' written in bold letters.