Watertown Police Sgt. John MacLellan was the second officer to arrive at the intersection of Dexter Avenue and Laurel Street where police faced the armed and dangerous Boston Marathon Bombing suspects. MacLellan told WBZ Channel 4 that he will never forget what his fellow officers did that night. He also vowed never to be in a situation where he runs out of ammunition – as he did that night when facing down the Tsarnaev brothers. He now carries extra ammo, according to the WBZ report.