"I was selected for the program as an infant. I had the indicators that made me suitable for the process." Historians had certain things that were changed, making permanent changes to their memory retention and recollection, even when they left that brain behind.

"Oh." Philip gives a sad smile. "No, Kyle. It's a one way trip. We know that going into it. It's... a cut and paste procedure. Our bodies don't survive the transfer process. They experimented in ways to do it, but it's just not possible. Transfer to a new body is permanent. And the transfer back in time more so. I came into this body knowing I would live out whatever life I have left in it. And we don't know. We don't know when we've succeeded. What we're doing, it's never been about us. We're expendable."