Steel pot.
no
$100 see ebay
check jarheads definition
the answer to that question is the world war II memorial
Steel pot.
yes
Both helmet and gas-mask .
no
$100 see ebay
ARP actually and they wore clothes and a helmet with a w on it
there are THREE fastners that hold the liner in place. they are located about mid-way up on the sides of the helmet. they are REMOVED from the INSIDE of the helmet
check jarheads definition
In WWI they were nick-named "coal scuttles", as they reminded people of them.
Since only one helmet in WWII had a liner, the US M1 helmet, that's the one you probably are asking about. It weighed very close to 5 pounds.
the gumby war
There are several dealers of WWII memorabilia on the internet. Just search the internet for what you want.