I'm talking about where you have a unlimited amount of bombs that you have to use to destroy ground targets.

The only games I know that use this are Xevious, Dragon Spirit, Ajax...how come this feature became just a brief fad in the shmup history? I really like it and thinks it makes shmups more interesting to play. It's also more "realistic" when you think about it, since it doesn't make sense that you can be shooting aerial targets and ground targets with the same weapon.