The following is the Oct. 26, 2018 Congressional Research Service report, Coast Guard Polar Security Cutter (Polar Icebreaker) Program: Background and Issues for Congress.
From the report
The Coast Guard Polar Security Cutter (PSC) program, previously known as the polar icebreaker (PIB) program, is a program to acquire three new heavy polar icebreakers, to be followed years from now by the acquisition of up to three new medium polar icebreakers. The Coast Guard wants to begin construction of the...
https://news.usni.org/2018/10/30/report-congress-coast-guard-polar-security-cutter-program