I calculated this time, probably every 12 hrs there is a supply drop, and most likely you will get 12k gold or food, or 300 oil. So far nothing else for me.
To get tactic armies... In game, disable wifi/LTE, claim supply drop, if tactic army then re-enable wifi/LTE and keep playing. If no tactic army, then exit game with internet still off. Close game. Restart wifi/LTE, restart game. Turn off wifi/LTE, claim supply drop. If no tactic army, exit game again, restart wifi, etc. Rinse wash repeat until you get tactic army. It's sorta tedious but it works, and you'll end up with a bunch of tactic armies at the end of the event.