We have a dedicated forum for Axis & Allies 1942 Online.
As the rules for the online game in some aspects differ from the boardgame ruleset, please open topics related to the online game in this category:
What is the purpose of the dice the players would sometimes place on a territory or the board throughout the game? They appear to be markers of some sort.
Referring to the 1942 SE time lapse video posted on the home page of A&A.org here.
After replaying it on slow speed, it appears that they are using dice as aircraft range markers and bomb damage. I hadn’t thought of using dice for range markers but it makes sense. More practical than using cardboard chits.