The 2003 Printing This section details the effective and proven method of training the soldier in preliminary rifle marksmanship. The following marksmanship training guide contains the current tasks that are trained in basic rifle marksmanship programs, during basic combat training at Army training centers (ATCs), and during infantry one-station unit training (OSUT). It provides a basis for structuring unit sustainment programs. The unit normally performs a diagnostic test of the tasks and only conducts training on specific periods for soldiers who must improve their basic firing skills. Training is usually conducted in a shorter time frame than at IET.