Advanced Structures Corporation is a leading developer and manufacturer of high-quality MJ doors. Though located in New York, we are a nationwide distributor for all of the military joiner products we manufacture. We have a great selection of MJ doors that can be specifically customized to best fit your needs. Among the types of MJ doors we manufacture for the US Navy and Coast Guard includes extruded doors, fume tight fire zone doors, honeycomb doors, and ultra-lightweight doors.