Like the rest of the military, the safety centers responsible for analyzing military aviation crashes to prevent future accidents also faced funding and staffing cuts, which impacted their ability to conduct some types of investigations, service commanders testified Wednesday.

The heads of the Air Force Safety Center, Army Combat Readiness Center and Naval Safety Center — which addresses both Navy and Marine Corps accidents ― appeared before the House Armed Services Tactical Air and Land Forces subcommittee to describe what actions they have taken to date to address a rise in military aviation accidents.

The hearing was the first in a series the subcommittee is planning to understand why military aviation accidents are going up, said subcommittee chairman Rep. Mike Turner, R-Ohio.

A Military Times investigation in April found that manned warplane accidents have spiked almost 40 percent since 2013. Fatal aviation accidents reached a six-year-high in May, with 12 fatal incidents claiming the lives of 35 service members.