#1 : A Good Order Squad in a hex with a Good Order leader may split into two Half-Squads
This rule is part of the Rally Rules in the original rulebook and comes
right after the rule that says two Good Order Half-Squads of same nation
and IB can be combined into a single Squad if with a Good Order Leader
#2 : Vehicles work the same in the original book as in the current rules, there are no obvious
differences. Vehicles rules are still very lengthy and cover many pages.
#3 : The original rulebook is very short by comparison to the current rules, at only 29 pages for the entire
book. There is a lot more clarity and a lot less ambiguity in today's Modern Era rulebook, but it is also
much longer.The original rulebook is also written specifically for the Vietnam game being depicted, so
there are some rules for US, ARVN, NVA and Viet Cong units, which are the national characteristics.
These would be located in the module-specific rule books for LNLT games printed today.
#4 : I'm happy to be of help