The Pentagon is trying to finalize an order for 12 new ballistic missile submarines, the lead ship of which will be named USS Columbia (SSBN 826).
The Navy hopes to place the order before the Trump administration takes office.
Concept art of USS Columbia (SSBN 826). Image by Naval Sea Systems Command
According to reports by the Daily Caller and USNI News, the order will permit the Navy to start the process of designing and building the submarines. The Congressional Research Service reports that the sub will carry 16 Trident ballistic missiles, a decrease from the 24 missiles carried by the 14 Ohio-class ballistic missile submarines presently in service.
Four other Ohio-class submarines were converted to fire BGM-109 Tomahawk cruise missiles and to support SEALs with covert commando raids.
According to the CRS report, the Columbia-class submarines are expected to be 560 feet long and 43 feet in diameter, roughly the size of the Ohio-class submarine. The vessels will have technological improvements, notably a reactor that will not require refueling as well as taking advantage of techniques used to build the Virginia-class submarines, including modular construction and the use of open architecture to make upgrades easier.
Earlier this year, BreakingDefense.com reported that the vessels will be built by Electric Boat.
Concept art of the Columbia-class submarine. (US Navy graphic)
This would be the ninth ship to carry the name USS Columbia in U.S. Navy service. The eighth, a Los Angeles-class attack submarine, is still in service and has the hull number SSN 771.
A 2013 Navy release states that the first Columbia-class boomer is expected to begin construction in 2021, enter service in 2027, and undertake its first deterrence patrol in 2031. According to a report by USNI News, each sub is expected to cost about $8 billion.