sentences:  McKenna returned to his home town of Birkenhead to become manager of Cammell Laird but left the club soon after, later becoming chief scout at Cambridge United before joining Altrincham as assistant manager.In September 2010, he was appointed caretaker-manager at the club following the sacking of Graham Heathcote.Following an improvement in the team's results under McKenna, he was later handed the job on a permanent basis.