Google. They use their military style shit all the time for no reason at all. One example.
http://www.salon.com/2013/07/07/“why_did_you_shoot_me_i_was_reading_a_book_the_new_warrior_cop_is_out_of_control/
Cops like their toys. The toys make them feel like big strong men. And result in deaths of civilians for no particular reason.