Contractors Ty Lyttle gets help from Jesse Lynn Tullis and Sam Brown, Advanced Integrated Tech, to position a twin diesel engine onto blocks aboard the Corps' derrick boat Elizabeth. On Oct. 9, the Norfolk District, U.S. Army Corps of Engineers derrick boat Elizabeth's "green initiative" transformation began with the installation of two new fuel-efficient and EPA-compliant marine propulsion diesel engines. The project includes two companion diesel generators, housed in sound-barrier boxes that significantly reduce noise pollution and exhaust emissions. The eco-friendly engines have a 25-year life span.