We’re not all teens on Lemmy lol. The Delta Force game engine was ground breaking at the time; it used voxels to render terrain meaning the draw distance was huge and enabled sniping each other over hundreds of meters (previously unheard of).
Sadly this new game doesn’t appear to carry the “tactical shooter” banner in the slightest.
You should spin up a co-op modded server and play a few missions with your dad to make his day.