Officials in San Jose and Davis took steps to jettison their so-called Mine Resistant Ambush Protected vehicles this week.
Also in recent days, a sheriff in New Jersey said he would stop the acquisition of a similar vehicle, and two police departments in North Carolina announced plans to hold forums to hear concerns about law enforcement's militarization.
Much of the controversy over the use of military equipment centres on the Pentagon's excess property program, which gives unused equipment to police forces across the country. The program has come under scrutiny after protests over the shooting of an unarmed black teenager by a white police officer in Ferguson, Missouri, where rifle-toting police in armoured vehicles faced off against demonstrators in a response critics say helped fuel outrage.
President Barack Obama has ordered a review of the program, a senior administration official said last week.