U.S. Army 2nd Staff and Faculty Company Watercraft Engineer Certification Course students rebuild Detroit diesel 12-V-71 series main propulsion engines at Fort Eustis, Va., May 21, 2015. During the course, students learn maintenance procedures and how to repair Army vessels. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

U.S. Army Warrant Officer Randy Saucedo, 2nd Staff and Faculty Company Marine Engineering Officer Basic Course student, performs a tune-up on a diesel Landing Craft Utility-2000 generator at Fort Eustis, Va., May 21, 2015. During the tune-up, generator parts must be gauged to exact torque values to prevent serious damage. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

U.S. Army Second Staff and Faculty Watercraft Engineer Certification Course students Sgt. Benjamin Acevado,right, and Sgt. Adrian Orta, tighten bolts during an engine rebuild at Fort Eustis, Va., May 21, 2015. While tightening bolts, students must also check the torque value of each to ensure they reach and do not exceed an exact pressure. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

U.S. Army Sgt. Jeff Schweiger, 2nd Staff and Faculty Company Watercraft Engineer Certification Course student, attaches an engine head to an engine lift at Fort Eustis, Va., May 21, 2015. When attaching the head, consisting of valves and fuel injectors that provide air and fuel to the engine, Schweiger conducted an engine rebuild as part of the certification course. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

U.S. Army Warrant Officer Lewis Bryce, 2nd Staff and Faculty Company Marine Engineering Officer Basic Course student, checks the torque value of injectors and valves of a diesel Landing Craft Utility-2000 generator at Fort Eustis, Va., May 21, 2015. Throughout the course, warrant officers learn how to engineer onboard any class of Army vessels. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

U.S. Army Warrant Officer Lewis Bryce, 2nd Staff and Faculty Company Marine Engineering Officer Basic Course student, gathers tools to perform a tune-up on a diesel Landing Craft Utility-2000 generator at Fort Eustis, Va., May 21, 2015. Tune-ups are annual services performed on generators as well as for most other Army vessels and boat generators. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

U.S. Army 2nd Staff and Faculty Company Watercraft Engineer Certification Course students rebuild Detroit diesel 12-V-71 series main propulsion engines at Fort Eustis, Va., May 21, 2015. While working on engines like the 12-V-71, students must use precise measures when maintaining or repairing any part. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

U.S. Army Sgt. Benjamin Acevado, 2nd Staff and Faculty Company Watercraft Engineer Certification Course student, tightens a locknut during an engine rebuild at Fort Eustis, Va., May 21, 2015. During the engine rebuild, students learn the steps of repairing and maintaining a diesel engine for any Army vessel. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

U.S. Army Sgt. Jason Cole, 2nd Staff and Faculty Company Watercraft Engineer Certification Course student, tightens engine parts during an engine rebuild at Fort Eustis, Va., May 21, 2015. Upon completion of the course, students are certified to maintain and repair any Army vessel. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

U.S. Army 2nd Staff and Faculty Watercraft Engineer Certification Course students rebuild Detroit diesel 12-V-71 series main propulsion engines according to technical manuals at Fort Eustis, Va., May 21, 2015. The engines are rebuilt according to the engine’s technical manual and safety notes to ensure no mechanical or safety mishaps occur. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)