Coast Guard Chief Warrant Officer Walt Probst, the test officer for PMRO Gulf Coast, pushes the button to start the LM2500 gas turbine engine aboard Bertholf (WMSL 750). Observing the moment when the first of the ship's three engines comes to life are (left to right) National Security Cutter program specialist Leo Tallent, test electrician Jeff Cwiok, test electrician Mike Asiala and Jim French, National Security Cutter deputy program manager. The Northrop Grumman-built U.S. Cutter Bertholf (WMSL 750) reached a significant milestone Aug. 7 as the first of its three main engines was brought to life. Known as gas turbine engine light off, the procedure was an initial operational test of Bertholf's combined diesel and gas turbine propulsion system.