The US Navy has launched a Service Life Extension Program to extend the life of the Landing Craft, Air Cushion (LCAC). The extension work consists of upgrading systems, replacing engines, and repairing structural components, including replacing damaged areas on the underside of the deck or buoyancy box. The Navy has contracted with L-3 Communications Unidyne, Walashek Industrial & Marine for performing updatation program at Camp Pendleton, California. Walashek will perform complete overhaul and repair of marine boilers, structural and piping system fabrication. A peripheral skirt system is used to hold the cushion of air and connect to the LCAC's buoyancy box, which is designed to keep the craft afloat. The program uses the welding inverter for the project that provides a 5-to 300-A output range, and permits adjusting frequency from 20 to 250 Hz.