FLORHAM PARK, N.J. (AP) — Dalvin Cook has officially joined the New York Jets' backfield.The team announced Wednesday it signed the former Minnesota Vikings star, who watched the end of the Jets' joint practice session with the Tampa Bay Buccaneers, took his physical and handled the paperwork for his one-year contract."Jet Nation, D.C. is in the building and I'm happy to be here," Cook said in a video posted by the Jets on the X platform, formerly known as Twitter. "I'm happy to be part of something special. Let's get this thing rollin'. Gang Green, let's go."Cook, who turned 28…