what was in the arrow heads?

C4 plastic explosive most likely, but the movie clearly exaggerates the destructive power of such a small amount. That small arrowhead's worth would not completely obliterate a truck, nor a helicopter gunship like it did in Rambo III. Even Ltn. Tay's explosive death of being completely blown to shreds is a massive stretch. He would've died, yes, but there would've still been a recoverable corpse, as opposed to the small bits of flesh and a pair of smoking boots we were shown in the movie.

Testosterone.

...For every man who has ever lived, in this universe, there shines a star.
-Arthur C. Clarke

and it's glorious, damn awesome.

Mini-nukes, apparently. In reality, there is no conventional explosive which can cause such a big explosion from such a small quantity; not even close, and there's no such thing as a nuclear warhead that small either; not even close.

Those arrows were loaded with 100% AMERICA!!!

Rainbows and Unicorn farts.

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