This bill expands what fire departments can use federal grant money for under the Assistance to Firefighters Grant program. Specifically, it allows grant funds to be used to support behavioral and mental health services for firefighters, including creating or expanding peer support programs that are based on proven, evidence-based practices. The legislation affects fire departments across the country that receive these federal grants and aims to address mental health challenges faced by firefighters. The bill does not specify new funding amounts or timelines, but rather modifies existing grant program rules to permit these mental health-related uses.