Well you have a white bar under a card that turns yellow when it is complete. I see a white bar under your heavy weapons because not all your heavy weapon kills are complete. When I open your heavy weapons tab, I see a white bar under the cars for machine guns (the bar shows the progress) and a yellow bar under rockets (saying its complete). When you complete both types of heavy weapon kills (rockers [u]and[/u] machine guns) the bar under your heavy weapons tab will fill up and turn yellow.