NAC Marines

I want to order a pair of NAC Marines armed with PIGs to add to my 
USCM Colonial Marine Platoon, but looking in the CMD catalog at my local

store didn't give me much info.  There are no pictures, and the only 
description is "Heavy Weapons" and "Heavy Weapons Command".  Are these 
heavy weapons RPGs?  PIGs?  SAWs?  I've seen the NAC Riflemen and
they're 
awesome--and they look close enough to my Leading Edge Games Colonial 
Marines for government work, but could someone in the know help me out 
with the preceeding quandry?  What NAC blister pack should I order?  
Thanks in advance.