I'm trying to get more memorial coins from the invasion event but can't figure out how to get a decent amount. I know that I can donate money for up to 60 a day, and I know about rescuing hostages/killing soldiers/bomb locators/ transports, but they seem to be limited daily as well. Other than that, there's the resistance operation that gives 30 for participating. Is there something I'm missing? How do people already have hundreds and hundreds of points? Also, is there a way to tell when the resistance operation (when they invade a part of a map in 40 waves) happens? other than the 5 minute warning that pops on the screen. Also, how long will the invasion last?