To form small teams, especially pairs, to reduce the likelihood of an individual suffering harm without being noticed or because of the nature of the task to be accomplished
to "be a man about it"; to do the things a good man is traditionally expected to do, such as: taking responsibility for the consequences of one's actions; displaying bravery or toughness in the face of adversity; providing for one's family, etc
Hey son, man up, ok? There will be time for tears later.