Uhhh, folks....while we can all agree that its nothing more than a shill game concocted by the ****heads in DC.... there is a minor difference in the Hazmat Endorsement and the TWIC.
CDL Hazmat Endorsement is STATE
TWIC is FEDERAL
I asked the "why" question at my local drivers license office and it was very politely explained to me by a really cute young lady with a really nice smile.... and she's right!