A USCG turbine liscense won't cut it, I would bet he is qualified to test for a stationary engineers liscense, he could call city of detroit building and safty engineering dept, they will send him an app. remind the guy that stationary and shipboard powerplants are different in that stationary plants have more safety devices, example, low water cutouts, I spent 4 yrs on and old ocean going vessel as a boiler tech., USS Pyro. most people in this field for Fords went through the app program, When I was hired a First class stationary engineers license was required, I got lucky cause no app was ready when one was needed. A first class liscense isn't something you just go test for, The max your friend will be able to test for is a 3rd class, you need to hold the third for a yr, then go for second, hold that for 2 yrs, then try for the first class license. Best of luck.