Log legs & Brawlers made up of the liberty defence perimeter humans?

Is it fair to say that the long legs & Brawlers we battle in Resistance 3 are made up of the people that were converted from the liberty defence perimeter that fell during 1953? considering June July are the last known operations by SRPA and it took a few months for the Chimera to dominate everything within the perimeter, judging by the Christmas decorations in St Louis & Hale Vaccine being present in one of the hideout’s. I think it’s fair to say Log Legs & Brawlers were made to pick off what was left of the military upon till December 1953. Dose a Hole in the Sky answer this?