the entire Emergency Response Team at the Buffalo Police Department has resigned in a show of solidarity for the cops suspended for shoving an elderly man to the ground. A total of about 57 officers walked off the job Friday, though they are still employed with the police department -- just no longer on the ERT ... according to WIVB reporter Dave Greber. The move comes less than 24 hours after video surfaced showing cops in heavy gear shoving 75-year-old Martin Gugino even though he was NOT being physically confrontational. A rep for Buffalo PD allegedly told a lcoal reporter...