Should we pray? Sure. But that's not the point of this thread is it? No one is saying not to pray.
I was just reading Mere Christianity, CS Lewis says a few things related to the subject. "All killing is not murder any more than all sexual intercourse is adultery. When the soldiers came to St John the Baptist asking what to do, he never remotely suggested that they ought to leave the army; nor did Christ when He met a Roman sergeant-major - what they called a centurion." In Lewis' opinion, "It is ... perfectly right for a Christian judge to sentence a man to death or a Christian soldier to kill an enemy."
Did John the Baptist or Jesus say anything about "dropping bombs?" No. But that's a straw man argument anyway. They said nothing about the internet, automobiles, or trips to the moon either.
Yes, pray - regardless of your opinion about war. While you're at it, pray for the well-being of our soldiers, sailors, airmen and Marines - especially those that are saved. And thank God for their service to protect your freedoms.