i to have just finishd this mission (well last night), i was having the same problem with the ABANDONING CONVOY, i finaly figurd out that one of the bradily crews had got out for some reason, once i got them back into the bradly it was all good, completed the mission within 10 mins after that so
MAKE SURE YOU HAVE 2 OTHER VEHICLES WITH YOU!!
a total of 3 units should be in the CONVOY ABRAMS, BRADLY and LINEBACKER
the UAV is allready called in, you have to GET OUT OF YOUR ABRAMS and GO OVER 2 ONE OF THE BRADLYS, it will have an option, UAV viper 3 (or somthing to that effect!!)
once you click on that option you will be in the uav able to search for the crew
when i did it the crew was in
the far left camp, not the observation post or the millitary post, i cant emember what it was called but it was the one on the far left
hope this helps, i spent about an hour trying to figure out what ws causing it on my game, but once it was fixd it was easy!!
i think its a bug that happnes wen you go to save the vilage - one of the bradly crews gets out, dont know why, maby they need to take a piss