A federal program that has drawn criticism in recent weeks for supplying surplus military gear to local police has also provided high-powered rifles, armored vehicles and other equipment to police at public schools, some of whom were unprepared for what they were getting.

In the wake of school shootings in Newtown, Conn., and elsewhere, some school security departments developed SWAT teams, added weapons and called on the federal government to help supply gear. But now, the program is facing renewed scrutiny from both outside observers and schools using it.

The Los Angeles Unified School District stocked up on grenade launchers, M16 rifles and even a multi-ton armored vehicle from the program. But the district is getting rid of the grenade launchers, which it never intended to use to launch grenades or use in a school setting, said Steven Zipperman, chief of the Los Angeles Schools Police Department. The launchers, received in 2001, might have helped other police in the county disperse crowds by shooting rubber munitions, he said.

But the district never used them, and the technology is outdated, said Mr. Zipperman.

In July, the district received a massive MRAP armored vehicle. Mr. Zipperman said his department thought it could be useful for evacuations and to save lives in a "sustained incident."