As far as we know, UGB has large explode size and huge damage in ACAH but need aim by hand. If climb for a clear shot you'll easier be hit by AA fire and you need drop 10-12 UGBs to destroy it. It takes too long.
Yesterday I found the ships in the stage can be critical hit by player's machine gun, so I decided when I entered ASM, fire my gun firstly because in ACAH, gun's range is enhanced to 2000 meters so it can hit carrier immediately. Tap slow down button as normal to give more shooting time for more damage with gun. Before I closed to the range of bombs, my gun keep firing. It can avoid much AA fire from hostile and finally I just drop 4-6 bombs to finish it in first ASM route.
Ace Combat: Assault Horizon Statistics For LEE SAIONJI
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