For context: Vietnam had 40 million people during the war, the US sent 550,000 troops there and it lost the war
Iran is 5 times the size of Vietnam, has 2.3 times the population, and is just as determined to kick GI butts as the VCs were. And Iran has just mobilized a million troops.
How will 13,000 US troops become anything other than dead bodies and war prisoners in very short order, pray tell?