The player and his squad is only transported unit in this bradley group, so TR UNLOAD would works...
I guess patch 1.54 is a little bit buggey. I found other "strange" things after applying this patch.
Before 1.54, this new WP (TR UNLOAD) works well. But the truth is, before this new patch, I only tested this part of my mission in peace (no enemy units). But now - when TR UNLOAD didn't work - the bradleys come out in a warzone, so they are aware or combat status... Where they HAVE to unload transport, there is no battle, but they are teleported (while a cutscene) from the warzone.
Acctually, I remove my first problem, because I left my idea to join Stryker by script in the middle of the mission and I join it to the Bradley group in design time. So I have only one question:
If I have a Striker (and the crew - I guess is only a driver) and I join it to a group, how can I check is it in the group or not? I tried: stry in units bradgrp but it never became true.