Can you check if your version has these stats for the AA unit?
AA Battery, nil, 0, 1.,0, 5a,5d, 2h,1f, 20,0, 1, Gun, 010000000010000
If not, I have the latest rules file here...Just save, drop in your folder, and reload.
The american battleship was sighted near the Philippine Islands, unfortunately my own battleship sunk at the same time.