I downloaded your file but i think its not animated.
The UT99 models are vertex animated and look like different, they have framed models so you get this sort of exploded view with
duplicates of the model in different positions.
This in 3dsMax
and Wotgreal
I could theoretical pick all those frames apart since they are colored and numbered when importing in 3dsmax and use it as reference for skeletal animation, as you can see i picked a few apart already, 1 is a forward flip and the other is where Soldier male is throwing his hand in the air before dying like he is being electrocuted.
Wotgreal can export .3ds and wich you can import with 3dsMax.
yesterday i tried binding the ps2 rig to a default UT99 character and it worked pretty good i think for a first time,