School police departments across the country have taken advantage of free military surplus gear, stocking up on mine resistant armoured vehicles, grenade launchers and scores of M16 rifles. At least 26 school districts across the country have participated in the Pentagon's surplus program. Federal records show schools in California, Florida, Georgia, Kansas, Michigan, Nevada, Texas and Utah obtained surplus military gear. Nearly two dozen education and civil liberties groups sent a letter earlier this week to the Pentagon and the Justice and Education departments urging a stop to transfers of military weapons to school police. The Los Angeles Unified School District - the nation's second-largest school district, enrolling more than 900,000 students - said in a statement this week that it would remove three grenade launchers it had acquired under the program in 2001 because they are not essential life-saving items within the scope, duties and mission" of the district's police force. But the district plans to keep 60 M16s and a MRAP, a military vehicle used in Iraq and Afghanistan that is built to withstand mine blasts. Los Angeles school board member Steve Zimmer said the district will likely also let go of the MRAP, too. The board was told of the specific equipment the district had received only after the protests last month in Ferguson, Zimmer said. Jill Poe, police chief in the Southern California's Baldwin Park school district, said she'll be returning the three M16 rifles acquired under her predecessor.