He's a 10-year 'veteran' with/of the team.
a 'veteran' of the political scene
a 'veteran' politician
(..) The thing you'd never think to check. Those people were already dead. Before the bomb went off? That's what I'm saying. Darius Michaud was a -year veteran... Michaud was a patriot. The people he was loyal to know their way around Dallas. They blew that building to hide something. (..)1998 The X Files