The following are two excellent reports to Congress by the USA's No.1 (overt) submarine analyst, Ronald O'Rourke "Specialist in Naval Affairs" writing for the Congressional Research Service (CRS). The reports are:
1. Oct. 25, 2016 CRS report, Navy Columbia Class (Ohio Replacement) Ballistic Missile
Submarine (SSBN[X]) Program: Background and Issues for Congress. (7-5700, ww.crs.gov,
R41129) https://news.usni.org/2016/11/04/22361and
2. As earlier reported in Submarine Matters, Oct. 25, 2016 CRS Report, Navy Virginia (SSN-774)
Class Attack Submarine Procurement: Background and Issues for Congress (7-5700,
www.crs.gov, RL32418)
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