Helmsman McKenna was the conn officer assigned to the USS Enterprise for its launch in 2258

Hikaru Sulu was a last-minute replacement for McKenna, however, when the latter was diagnosed with lungworm. (Star Trek)

Helmsmen of the starships Enterprise
Enterprise NX-01:	Mayweather • Hutchison
USS Enterprise:	DePaul • Hadley • Hansen • Kyle • Leslie • Mitchell • Number One • Rahda • Spinelli • H. Sulu • Walking Bear
USS Enterprise-A:	H. Sulu • Valeris
USS Enterprise-B:	D. Sulu
USS Enterprise-C:	Castillo • Fredericks
ISS Enterprise NCC-1701:	H. Sulu
USS Enterprise (alternate reality):	McKenna • H. Sulu