Coast Guard Polar Security Cutter (Polar Icebreaker) Program: Background and Issues for Congress [Updated January 14, 2021] [open pdf - 2MB]
From the document: "The Coast Guard Polar Security Cutter (PSC) program is a program to acquire three new PSCs (i.e., heavy polar icebreakers), to be followed years from now by the acquisition of up to three new Arctic Security Cutters (ASCs) (i.e., medium polar icebreakers). The PSC program has received a total of $1,169.6 million (i.e., about $1.2 billion) in procurement funding through FY2020, including $135 million in FY2020, which was $100 million more than the $35 million that the Coast Guard had requested for FY2020. With the funding it has received through FY2020, the first PSC is now fully funded and the second PSC has received initial funding."
CRS Report for Congress, RL34391
Congressional Research Service: https://crsreports.congress.gov/