PSP help

[XxWickedz28xX]

Ive been playing this great game for a few days now and have finally to the assault on the Reichstag.

I cant figure out how to pass this level. I drop all my bombs on it, use all missles and the buildings meter dont drop below half strength. Then I fly around for a few minutes just shooting at it, usually I get shot down before I can finish off the building.

Anyone got any tips for me? This is for the PSP if that matters at all.

Thanks in advance guys!
Bill