700 troops and 20 tanks? Oh my! Pooty Poot will wet himself. /s
You may not be aware of American Military might.
Remember, the Soviets spent many years battling the Afghans and left in defeat.
We won in less then 2 months.
1 American tank, coupled with the highly trained and skilled crew is worth hundreds of Soviets.
Without adequate air and AAA support, they are nothing but targets.