Lawmakers are becoming more stringent with how the Pentagon can spend future funding, included on the services’ unfunded requirements list, according to a joint explanatory statement accompanying the fiscal 2021 defense appropriations compromise bill.

Congress is allowing the U.S. Air Force to say farewell to 17 B-1Bs and the RQ-4 Block 20 fleet, but is blocking the retirement of KC-135s, KC-10s and A-10s in the latest fiscal 2021 defense appropriations compromise bill.

Despite the U.S. Air Force demonstrating earlier this month how a piece of the Advanced Battle Management System might work, the fiscal 2021 defense appropriations compromise bill would drastically reduce the program’s funding.