Trautwein spent the last two seasons as Boston College's offensive line coach, and he helped guide seven Eagles to All-ACC and All-American honors during that time.
Penn State assistant coaches Kirk Campbell, Kevin Smith, and Kevin Reihner will join Mark Dupuis On Ricky Rahne's staff at Old Dominion.
Moorhead led the Bulldogs to a 14-12 record in his two seasons with the team.
Castro-Fields will be back as the unquestioned leader of Penn State's cornerbacks for his senior year.
Hamler was a go-to wide receiver for Penn State over the past two seasons.
Penn State Athletics confirmed that Limegrover's contract will not be renewed, and a national search for his replacement will begin immediately.