Correus
Adventurer
I've known them as woobies for at least 30 years.
From Wikipedia:
"Poncho liners were first used by the U.S. military in the Vietnam War. They gained the nickname 'woobie' later; that term is conjectured to have derived from the name for a child's security blanket in the 1983 movie Mr. Mom.[2]"
Interesting... in all of my years of being in the military, helping train military/non-military people after that as well as collecting military surplus all these years, I never heard it called a "woobie" until at a gun show a few years back.