If you are an ex-Nuke and ever wondered what Nuclear Power School and the submarine training prototypes look like click here. Idaho Falls NPTU is closed and submarine prototype training is provided using MTS's (Moored Training Ships). These are the former USS Sam Rayburn (SSBN 635) and USS Daniel Webster (SSBN 626). West Milton located in New York (formerly known as Ballston Spa) is the only other active land-based prototype training unit. The training pipeline has significantly changed also. Click here to see how nukes are raised today.