David Pacileo, firefighter with the Marine Corps Logistics BaseBarstow, Calif., Fire and Emergency Services Division, uses the TRXsuspension system while exercising, May 26. Pacileo and fellowfirefighters aboard the installation use the system for improved strengthtraining and flexibility. - David Pacileo, firefighter with the Marine Corps Logistics Base Barstow, Calif., Fire and Emergency Services Division, uses the TRX suspension system while exercising, May 26. Pacileo and fellow firefighters aboard the installation use the system for improved strength training and flexibility.