Hiya,
All's i can think offhand is you could be just too far out of required area (range) to get the kills, not totaaly sure on vanilla career but is there a 60k radius on some areas you get assigned to ?
Besides that no idea from memory
ps : Now you've got the amazon sh5, get the tdw generic patcher installed to fix many things and if you use the tdw's newui's install the options file editor viewer
And of course, OH2.5 + Grid patch and also OH 2.3 flag wind patch
