explosives, 1800 rounds of ammunition open fire killing wallin and wounding two other officers and a civilian pre-policpre-please identify thn as mahamad barakat who died in return fire. police say had he not been stopped by wallin and his fellow officers the government would have gone on to harm others. at his memorial service wallin was are numbered as a loving son, brother, fiancé, soldier, and police officer who set out in life to make a difference. he said his desire to serve came from wanting to have a purpose behind his job each and every day. and how he wanted to do something that he could tell himself at the end of the day that he had made a different somehow. looking across the room today, i can see that he definitely made a difference. this followed officer continues to make a difference.