My DM had some 5e burnout and wanted to try to run some other systems, suggesting both WHFRP 2e and Delta Green since they're both fairly simple d100 systems. We decided that since we have a few players that'll be fairly regularly missing sessions, that Warhammer would be our "default" group game with a party that has an overarching story, with Delta Green serving as a sort of casual one-shot/mini-arc game where we make multiple characters to team up in the absence of other players to deal with the horrors around the world that the government doesn't want us to know about for our own safety. I currently have an Archaeologist/Anthropologist/mythology nerd buddy-copping it up in northern Norway/Finland to investigate a missing persons case after our lead on a Troll turned out to be crazy people being crazy and accidentally running into a The Thing reindeer that bit a hunter, while a retired-Firefighter-turned-handyman is trying to keep a 15ft-tall shapeshifting beastman from brutalizing any more people in the woods of Arkansas and further traumatizing the poor rangers running the wilderness reserve it's holed itself up in.