Black Sun Reference 1 (Source)
In the file mob/creature_names.stf, some of the Black Sun NPCs have two versions:
mand_bunker_blksun_assassin mand_bunker_blksun_assassin_int mand_bunker_blksun_guard mand_bunker_blksun_guard_int mand_bunker_blksun_henchman mand_bunker_blksun_henchman_int mand_bunker_blksun_thug mand_bunker_blksun_thug_int
The true reason for one having _int and one not is unknown. However, I am going with the idea that _int is a reference to being "interior" meaning that the other one is "exterior".
According to Allakhazam [[1]], there are two different entries for each of these NPCs. One is for the Death Watch Bunker and the other is for Yavin IV. Since the NPCs in the Death Watch Bunker are inside the bunker (interior) and the ones on Yavin IV are in the wild (exterior), I have created seperate pages for the two types of NPCs listed using the corresponding information.
This information is subject to change and represents a "best guess" with available information.