Training Afghanistan's security forces is a key part of the United States' withdrawal strategy. US forces can't leave until an Afghan national army and police are ready to take over.<br /><br />But while top officials say the national police are improving, the marines doing the actual teaching have likened the task to directing a kindergarten class.<br /><br />Al Jazeera's Clayton Swisher caught up with some of the trainers in Garmsir, a small town in southern Helmand Province, to report their experiences.