the green is the difference been health totals of both teams , green has total health of 8340 , red has total of 7640 . so green has 700 more health than red , and that will change when damage is done. so if a red team tank takes a hit of 400 , that green number will go to 1100.
my understanding the yellow numbers at the right side of red health bar is for the amount of damage needed to do to get to ace tanker 3 , u go past that number u will get number 2 badge , even more number 1 badge , even more master badge