CBP pilots gain a second set of eyes through the assistance of specially trained Border Patrol Agents known as supplemental crew members (SCM), some of whom have a background in aviation. The SCMs assist the pilots in non-flying duties such as inputting GPS information and operating cameras on the aircraft. Qualification involves 20 training courses and 20 hours of experience in three different aircrafts. All SCMs are detailed for at least 18 months, many to the Southwest Border. Some SCMs extend their detail up to 3 years. From the information given above, it can be validly concluded that A) all Border Patrol Agents with a background in aviation are SCMs B) no SCMs are Border Patrol Agents with a background in aviation C) all CBP employees detailed for at least 18 months are detailed to the southwest border D) at least some CBP employees detailed to the Southwest Border are SCMs E) every SCM is detailed to the Southwest Border