Lawmakers are voicing concern that the Air Force's fiscal year 2021 plan to divest from legacy drone programs before next-generation platforms are ready could leave a gap in intelligence, surveillance and reconnaissance capabilities -- putting the service on the defensive as budget negotiations ramp up. The Air Force's FY-21 budget request proposes shutting down MQ-9 Reaper production early and retiring the service’s Block 20 and Block 30 RQ-4 Global Hawks -- about two-thirds of the fleet. The Air Force is...