reporter: marine veteran matisse ferrari is believed to be first time full time officer in united statest both legs in 2011, after landing on a 30 pound ied device, both legs had to be amputated below the knees. that did not stop mattis, just 3 months he was walking again and now a police officer in suffolk county, new york, he graduated friday, after completing 29 weeks of training there were no special waivers, passing all physical requirements with his titanium prosthetic legs. >> i am a guy given a second chance at life and giving back to the community. if i could be that police officer that i saw when i was a young kid who made a difference in my life, i would fila come blue chip. reporter: his wife and his two-year-old daughter keep him going, he moved to u.s. from uruguay when he was 6 years old. his colleagues were so inspired they made him class president, 28-year-old starts in upcoming week. >> an individual who sacrificed his body for our country, and he has overcome so mone many add as to be where he is today. reporter: two year ago he made headlines, he saved a baby from a b