I'll take a guess on what the relations between my group and the others will be like, taking into account that my guys are former NCR. Green is good, grey neutral, yellow is strained, orange is bad, and red is basically outright hate. I am including NPC and as-of-yet not accepted groups.

1st Mechanized Battalion / Hathaway Misfits:

[hider=Relations]
Player factions:

- 1st Battalion, Rifle Infantry -- Green
- 1st Republic Hunters Battalion "Black Death" -- Orange
- 1st Republic Energy Force -- Grey
- The Martin Rangers -- Green
- 1st Republic Infiltrators -- Grey
- 8th Underground and Recon Division -- Grey
- West Valley Division -- Red (at least until I read their origin)
- 1st Republic Dragoon Squadron -- Red

NPC factions:
- Yakima Defense Force -- Green
- Former Raiders -- Orange
- Vault 57 Security Personnel -- Green
- Unit 873 -- Yellow[/hider]

Some may not fall firmly in one category. Like the Martin Rangers. I feel like they'd get along with my guys, but considering my guys are former NCR, and the NCR represents a big, looming government that seeks to expand its jurisdiction and bring along taxes and whatnot, the Martin Rangers, being a very independent bunch, may look at my guys with a bit of distrust. 

By the way, having just noticed the name for the 8th Underground and Recon Division and the West Valley Division, I'd like to point out that a Division is a military unit numbering in the tens of thousands. We are only allowed two Companies as of now, which means the biggest type of unit should be a Battalion.