Sorry if this has been posted already but;

On the Battle Log, what does red circles and green circles mean? Also, stop signs?

"(Green Circle) Land Unit ###"
"(Red Circle) Land Unit ###"
"(Stop Sign) Defense ## (lost in flight)"

If you can answer me, thanks! :)

Green Circle means something was hit and destroyed.
Red Circle means something was hit, but not destroyed.
Stop Sign means something was not hit, as the jet/missile/etc was shot down before hitting the target.

(You'll occasionally see a green stop sign, meaning that a unit was destroyed, but the jets attacking it were destroyed on the return flight).

Thank you!