Tech-Com is a Resistance group lead by John Connor in the War against the Machines after the Judgment Day. In this story, it isn't the same destiny:
From the fact that John time-traveled to find Cameron's chip, we should know that Tech-com isn't a group led by John, now, in this future, it firstly was led by General Justin Perry. The Tech-Com base however, it's still Serrano Point Nuclear Power Plant.
The term "Tech-Com" was not used in James Cameron's original script treatment. However, in the Terminator ancillary material, such as video games, novels, and comic books, "Tech-Com" has come to be used as the name for the human resistance — specifically John Connor's force — against Skynet and the machines.