The US Air Force’s new Sentinel intercontinental ballistic missile program is now estimated to cost at least 37% more than the previously projected $96 billion, triggering a formal Pentagon review that will include whether to scale back or terminate the project.

Costs for the Sentinel may increase to as much as $162 million per missile when calculated in 2020 dollars, up from $118 million each, according to a new estimate being sent to Congress on Thursday. Those costs include new projections for expenditures such as construction of silos and launch control centers, and put the program’s overall pricetag at $131.5 billion in today’s dollars.