This gamre includes air defence fire on airborne landings which is new but also back dated to all other scenarios.
That said, the US player must land the SouthViet 1st Airborne Regiment at Chau Nhai (LZ) right in the ZOC of 3 enemy battalions.
This was the first unit to land and they didnt know that the 95th regiment was so close. The US did prepare the landing zone in advnace with F4 and B57 strikes (including A4's), but they were still heavily shot at with what was described as a lot of anti-aircraft fire.
Following that the battle intensified with more units landing in support.
The SouthViet 37th Ranger Battalion which were infantry supported by M113's (I chose to use a mechanised unit to reflect that) enter from the East. According to the Marines link they are closer but on the second day, so I have put them on earlier, but futher away.
you can see Nui Thien An, which seemed to have a brigade and a division but they didnt appear to become involved. I have made that a fortified location though as I guess it was some kind of base. It was also known as the Buddha Mountain.
There are also a cuple of unspecified companies that appear on the Marines link but I have not read it through fully enough to figure out how they fit in.
There is also the artillery as featured on the Marines link map but im not sure what they did either.