The United States Navy parachute riggers are now trained at Naval Air Station Pensacola during a 12-week (55-training-day) school. When they graduate, they do become PRs, but the rating is called Aircrew Survival Equipmentman. While in school they go through 9 courses, 3 courses of "Common Core" skills over 19 days, 3 courses of Organizational-Level skills for 17 days, and finishing with 3 courses of Intermediate-Level skills for 19 days. The first week is a course taught on materials manufacturing using the Consew 206RB-5 industrial sewing machine, dubbed by students and instructors alike as "Combat Rigger Sewing" or simply "Combat Sewing". Students will manufacture a "rigger bag" completely from scratch and will learn about tool control. The next course is NB-8 parachutes, where students will learn basics of parachute rigging, inspection cycles and nomenclature. This is followed by a course of general survival equipment named ESE. Then "O" strand begins with Survival I Fixed Wing, followed by Survival II Rotary Wing, where students learn inspection and maintenance concepts unique to squadron level work. The final "O" level subject is Survival Radios. "I" strand will start with NES-12 ballistic parachute, the Navy's most complicated parachute system, for advanced rigging concepts. Seat Survival Kits and Life Preservers finish out the entire course of instruction, where they will graduate upon completion. The PR "A" School House graduates one class every 7 training days. The Navy Enlisted Classification Code (NEC) of 7356-Aircrew Survival Equipmentman (IMA) Technician is awardable upon completion of advanced C-level training.