It seems that in the Star Trek TOS Movies there are two or three bridge officers constantly missing.
The first problem: is the missing First Officer. Although it is not very important to have a First Officer because in The Constitution Class starships, the first officer mans a station. The only time when there is a dedicated First Officer is in TMP, but that is only because Kirk says he is temporarily taking command of The Enterprise and demoting Decker to First Officer, leaving Decker to stand around while Kirk hogs The Captains Chair.
The second problem:
It seems that despite Spock being promoted to Captain in The Wrath Of Kahn. He is still Science Officer.
The third problem: is another missing bridge officer.
In TMP, they show a tactical station, manned by Checkov. Checkov's previous station is manned by Deanna (I mean, Ilia). When Ilia is abducted, she is replaced by Chief DiFalco who is still alive by the end of the film.
But she is gone by the next film. And Checkov is transferred to the U.S.S. Reliant. DiFalco seems to be replaced by Saavik, while Checkov is replaced by ... ?
The Search For Spock is pointless to examine because they are not given any assignment. Saavik is transferred to the U.S.S. Grissom and is seems Checkov is a navigator, tactical, and science officer.
The Voyage Home has Saavik departing yet again and Checkov takes over which leaves the Tactical position open.
The Final Frontier continues with the TOS Series arrangement, and it leaves the tactical position open.
In The Undiscovered Country, Valeris joins the bridge because Sulu is now captain of his own ship. But the tactical position continues to be unmanned.
There are plenty of characters that could have filled the position. Some of them had transferred elsewhere. Kyle and Rand are communications officers for other ships, and Chapel works at Star Fleet Command.
But why couldn't they just keep any of these other characters such as DiFalco, and Saavik,
and perhaps Xon who never even appeared on screen?
They could have filled the vacant positions aboard The Enterprise.
The first problem: is the missing First Officer. Although it is not very important to have a First Officer because in The Constitution Class starships, the first officer mans a station. The only time when there is a dedicated First Officer is in TMP, but that is only because Kirk says he is temporarily taking command of The Enterprise and demoting Decker to First Officer, leaving Decker to stand around while Kirk hogs The Captains Chair.
The second problem:
It seems that despite Spock being promoted to Captain in The Wrath Of Kahn. He is still Science Officer.
The third problem: is another missing bridge officer.
In TMP, they show a tactical station, manned by Checkov. Checkov's previous station is manned by Deanna (I mean, Ilia). When Ilia is abducted, she is replaced by Chief DiFalco who is still alive by the end of the film.
But she is gone by the next film. And Checkov is transferred to the U.S.S. Reliant. DiFalco seems to be replaced by Saavik, while Checkov is replaced by ... ?
The Search For Spock is pointless to examine because they are not given any assignment. Saavik is transferred to the U.S.S. Grissom and is seems Checkov is a navigator, tactical, and science officer.
The Voyage Home has Saavik departing yet again and Checkov takes over which leaves the Tactical position open.
The Final Frontier continues with the TOS Series arrangement, and it leaves the tactical position open.
In The Undiscovered Country, Valeris joins the bridge because Sulu is now captain of his own ship. But the tactical position continues to be unmanned.
There are plenty of characters that could have filled the position. Some of them had transferred elsewhere. Kyle and Rand are communications officers for other ships, and Chapel works at Star Fleet Command.
But why couldn't they just keep any of these other characters such as DiFalco, and Saavik,
and perhaps Xon who never even appeared on screen?
They could have filled the vacant positions aboard The Enterprise.