If the raw recruits can make it through the next three weeks of training, their families will get invited to witness their progress and they'll get to go home for the first time since training began

The marine recruits must complete a tough series of physical challenges in the gym, including three staggeringly high rope climbs. If they fail, they'll have to leave their troop

The recruits reach the challenging halfway point in training, which is often when many recruits leave the troop, either through failure or giving up, before training steps up a gear