their Marines’ professional growth. If Marines are not allowed or expected to use what they have learned, mastery of what has been taught in our schoolhouses may not occurInterferenceInterference occurs when new information competes with lessons that are being taught or that were previously learned. If a Marine has too many obstacles they become distracted, making it difficult or impossible to learn or even recall instructions. Small unit leaders must know theirMarines well enough to identify actions that may be the result of such interference and assist the Marinewith removing the interference.• Assistance may be in the form of a simple reminder or may require more remedial effortsSelf-sustaining MarineThese are Marines headed toward successful enlistment, who are capable of aiding others in sustainment.At-risk MarineAn at-risk Marine is headed for first- term, non-expiration of active service (EAS) attrition.• Their actions and attitudes conflict with institutional values• They may begin to display discontent for any and all authority.TYPES OF OBSTACLESObstacles to sustainment vary from unit to unit and are therefore difficult to define for the entire Corps. Generally, an obstacle is anything that detracts from a unit’s ability to establish a productive environment for its Marines. These obstacles to the transformation weigh heavily at key decision points in a Marine’s career and can mean the difference between being at risk or self-sustaining.To provide a productive environment, leaders must commit to identifying obstacles and determining howthey can be overcome.