Prime Timeline Edit
Viggo Timeline Edit
Leonard "Old As Balls" McCoy is one of several Starfleet admirals that frequently makes use of the USS Hood in its capacity as the "admiral bus" to travel through Federation space.
When Dr. Borik took a leave of absence from the Hood to deal with his pon farr on Vulcan, McCoy was in the process of using the Hood as transportation. The admiral chose to assign himself as the acting chief medical officer of the Hood in Borik's absence, having felt fairly bored lately. (SS: "Excelsior Captains Mailing List")