As of yet there are no "Hero" or "Captain" Special Forces units in the Imperial lists.
The name denotes a figure with a different weapon selection than the normal troops and it just retained the 2cd ed naming scheme.
The Hero is armed with an Interceptor SMG and an ASH 88 Chainsword (as well as grenades on the belt)
The Captain is equipped with a Mandible Shotgun.
If you want to Wysiwyg the forces out you can bitz order the individual figures.
Though more costly it would prove effective in fielding smaller units of like equipped models, such as the BlackBerets with their Interceptors.
-PFC joe
(and don't worry, further expansions will most likely add individuals for each and every Clan)