I mean, most of them are already available, but to summarize:
-6 Pfadian Infantry Regiments (245th, 246th, 247th, 248th, 249th, 250th).
Of these, 249th has bonuses for having been part of Dohnany's command during the stabilization of Nostrega Primus. All of them share Pfadian Training, which "ensures this regiment always knows how to react to the enemy", which sure sounds like "cannot be caught by surprise".
Additionally, the 250th (Dohnany's former regiment) is composed entirely of veterans, though with us having been "promoted" and dragging Kanopka with us, they are currently suffering from a lack of senior officers, resulting in reduced combat effectiveness.
Current Assignments:
245th: Garrison (Nostrega I Hive Gamma: This is where Vandire happened.)
246th: Garrison (Nostrega I Eastern Wilderness)
247th: Garrison (Nostrega I Hive Alpha: This is where Jaghatai and Tuono are.)
248th: Garrison (Nostrega I Hive Beta)
249th: Garrison (Nostrega Primus Canzanelca Central)
250th: Garrison (Nostrega Primus Hive Alpha)
-3 Nostregan Penal Regiments (2nd, 7th, 8th)
Notably, all three of these are receiving bonuses for having been part of Dohnany's command during the stabilization of Nostrega Primus.
Current Assignments:
2nd: Garrison (Nostrega Primus Canzanelca East)
7th: Garrison (Nostrega Primus Valksia)
8th: Garrison (Nostrega Primus Hive Alpha: Yes, the 250th Pfadian Infantry is there too. It looks like Alpha Hives will typically require two regiments to garrison it all.)
-2 Davrian Rough Rider Regiments (27th, 35th)
Neither of these currently have any notable traits, though obviously this will change soon enough.
Current Assignments:
27th: Operation Vandire (Nostrega I Hive Gamma)
35th: Assist Arbiters (Nostrega I: no specific location)
-2 Behrian Artillery Regiments (115th, 211th)
Neither of these currently have any notable traits either.
Current Assignments:
115th: Garrison (Nostrega I Eastern Cities: This is where Fuoco should be.)
211th: Garrison (Nostrega I Hive Delta)
-1 Nostregan Infantry Regiment (1st)
This is specifically Passero's regiment. As Passero is the current Brigadier General of Nostrega Primus, this is probably not leaving Nostrega Primus any time soon. Also gets the bonus for having been part of Dohnany's command during the stabilization of Nostrega Primus.
Current Assignment: Garrison (Nostrega Primus Canzanelca South)
-1 Angraxian Tank Regiment (6th)
Alfonix's regiment that bravely charged into an Underhive with the expected results of a tank regiment charging blindly into an Underhive. While they don't have any notable traits, they are pretty thoroughly mauled and are taking combat penalties until they can recover. They're unlikely to recover before we're done here.
Current Assignment: Garrison (Nostrega I Hive Alpha)