I haven't played it, but the descendant of Harpoon is Command: Modern Air/Naval Operations, with some of the creators of Harpoon having developed it. It's descr

I haven't played it, but the descendant of Harpoon is Command: Modern Air/Naval Operations, with some of the creators of Harpoon having developed it. It's described by players as being bigger in its ambitions and more detailed than the original Harpoon, and something that can actually be useful for learning.