Adds 8 (15 counting variations) new turrets for dealing with alien menace, as well as other military-related items. Good compliment to mods that add new biter types, like Rampant or Natural Evolution.
These are the American turrets from the game Original War. Have you ever planned on adding the rest of the turrets from that game? I'm mainly thinking about The Russian turrets that slow down enemies.
I picked american ones, because sprites were easier to transfer into Factorio engine. No plans to add more - there is enough variety, adding more would be redundant.