The two innovations that helped the Assyrian Empire become a great military power are:
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Development of iron - The use of iron weapons and tools gave the Assyrians an advantage in terms of strength and durability over their bronze counterparts.
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Use of cavalry and chariot forces - The incorporation of cavalry and chariots into their military tactics allowed for greater mobility and effectiveness in battle.
So the correct responses are development of iron and use of cavalry and chariot forces.