Finding Slice of Slice Anime Help - feddit.org

So i only remember the Anime because i saw it on a YTPMV Yeaaaaaars ago and sadly cant find it anymore >.< But basically it was 2 Girls with SOlider Helments and i believe a fucking Bazucka in a praking Lot? XD Also there was another Scene tho maybe that was another Anime where also these Loli Type Anime Girls with their Soldier Helmets are in some kind of Cave or similiar? >.> So yea i looked for quite some time and couldnt sadly find Shit but its probably from somewhere in the 2010s around the Time Lucky Star existed >.>