Wikipedia article on Subs of the US Navy U.S. Navy's Submarine Service English submarines nuclear submarines Wikipedia article on Subs of the US Navy challenging and demanding missions Wikipedia.org: Submarines in the United States Navy Escape Tower United States has Happy Birthday to the United States Submarine Force submarines Submarines in the United States Navy nuclear submarines nuclear submarines U.S. Navy's Submarine Service Composition of the United States Submarine Navy nuclear submarines English U.S. Navy submariners U.S. Navy submariners