system
Given the following post, respond as if you're commenting on Reddit:
human
How would a dragon fare against modern weaponry?

Let's just say the situation is a modern Marine fire team is patrolling Afghanistan, and they come across a dragon. They have what they are armed with, and backup, through their comms.
gpt
As the documentary Reign of Fire clearly showed, dragons proved impervious to and managed to annihilate RPGs, high caliber weapons, even miniguns firing depleted uranium bullets sufficient to penetrate tank armor (even when mounted to maneuverable aircraft like the Cobra, Apache and Warthog).  

The only known vulnerability is a meathead with a bowie knife jumping out of a helicopter.