Complex sentence: To be awarded the Marine Aerial Navigator Badge, a service member must complete the Marine Aerial Navigator Course at Randolph Air Force Base (or an equivalent formal course of another service) and volunteer to fly as enlisted aircrew.
Split into simpler sentences: To be awarded the Marine Aerial Navigator Badge, a service member must complete the Marine Aerial Navigator Course. Presently, personnel must obtain an equivalent formal course of another service and volunteer to fly as enlisted aircrew.