I don't know if the verts suggest too much, mainly because we see verts in the pre-war part of the trailer, which is somewhat annoying and is possibly a retcon, and also possibly the source of verts in Boston. Not to mention I don't even think the EC BoS would have got their hands on too many Verts, it isn't like the Enclave would just hand them over, and they can easily escape from BoS cuz they can uhh fly away. So, the question is how many working verts could BoS snag from spoils of war, and I would think that number would be very low to just a couple. We know they have one, but I just don't see it as a very easy capture, so I doubt they would have too many. Maybe they could have learned to salvage damaged ones. But hey, a month to go and we will have the answers

That's not much of a plot hole; vertibirds aren't particularly tough to shoot down with small arms - just see Fallout 3, where the protagonist shoots down tons of Enclave vertibirds (and that's just one guy). Flying over the Fort would result in the vertibirds getting shot down almost immediately by the massed small-arms fire of an army if a single person can take one out with ease.

Hope there's a beautiful and mysterious lady called Morgan on the ship,

Fallout 3 made a specific point that vertibirds ARE hard to shoot down, hence why the BoS has you go get the Tesla Coil to make the Tesla Canon in Broken Steel.

Vertibirds could only be shot down by normal gunfire due to them being creature entites or something, due to how the game engine worked. You could blow up the Raven Rock entry door with normal gunfire for the same reason, doesn't mean its normally that easy to shoot down.

Possibly a dumb question:
Is it possible the airship(s) seen in the trailer don't belong to the BoS at all?

Maybe the nod to King Arthur with "prydwen" is indicative of another culture's influence. Maybe it's the Brits, and the beginning of an explanation as to
1) how a an area of the US / Canada came known as "the commonwealth" (under one monarchy)
And
2) how they would have crossed the ocean in the first place

Re-enactment of the revolutionary war ensues.

The Prydwen appears to be a fairly high tech airship compared to the Tactics ones, which I believe are represented in the artwork as a WW1 German Zeppelin design with attached rockets towing the Zeppelins backwards for some reason, along with a number of converted planes, a helicopter (chinook with a rocket fitted into the loading area) and a space shuttle.

My point would be the Prydwen seems to be either a rebuilt airship from much latter than the WCBOS were using or a new design. Either way the Prydwen is apparently a much higher tech version than any of the BOS have up to now scavenged or built. So its hard to say with any authority who could of built it, all of the BOS factions should have the knowledge of airships, but none that we know of have any recent experience of building or using them so until we get any new information any BOS faction could have built the Prydwen.

Or another tech savvy faction. One that would name a ship after a king. the Commonwealth for example.

On top of that, the trailers seem to indicate at least two different air ships. The Prydwrn looks way different than the blimpy one we see floating.

It has a Brotherhood symbol on it.

Massachusetts' official name is the Commonwealth of Massachusetts which is presumably where the name comes from and there is nothing monarchical about the term commonwealth. Historically it usually implied the opposite in fact.

Well there goes my pet theory about another goody goody BoS faction leading the charge against a foreign oppressor.

Didn't know that about state if Mass. I'll play my American immigrant card, having come here from a commonwealth country.

I definitely agree. By the end of Fallout 3 LBoS is a pretty large organization. I think the MWBoS is mostly isolated at this point, and the Outcasts are somewhat scattered. So, unless they are introducing a completely new Brotherhood chapter LBoS is the only one that really makes sense.

I'm with you on this one.
Air ships are pretty low tech. For a faction that deals in tech, it shouldn't be insurmountable.
What's more, I doubt when those who would become the MWBoS were sent on airships without compliment of mechanics and technicians, who know how they work. Pilots usually are pretty familiar with Aeronautics and the workings of their aircraft. So I gotta think some of the MWBoS know/knew their way around an airship.

Aside from trans continental and trans oceanic travel, they could possibly be used to patrol an area.
Although more visible, they're likely more quiet than a vertibird, and likely use less fuel.

There are 3 or 4 states whose official name contains "Commonwealth" in it.

However, no one ever uses them due to making the name too long for us Amerifats, and most Americans, even many who live in those states, don't know those full names exist to begin with.

Nonsense. There are much better ways to get rid of a bunch of malcontents than expending manpower and materials needed for the war effort to build a some airships and send them on a fake mission. Hell, all you would have to do is put them in a pocket with orders to "hold until releived" and let the NCR Rangers cut them off and carve them up.

The Western Elders wanted that mission to succeed, they just used it to temporarily get some people out of their hair.

Honestly its probably just because the term "Commonwealth" when applied to a state basically has no political meaning. Its essentially just title fluff for states. Like calling a cashier a "Sales Associate."

If its not Lyons, then I'd have to place my bets on a new chapter. Which would be unfortunate. Because, like I said, there's absolutely no reason to introduce a new chapter when the EBOS fits so perfectly.

There was no war effort. The BoS didn't go to war until after Fallout 2. Tactics takes place between Fallout 1 and Fallout 2.

Lyons =/= Eastern BoS. Lyons = Lyons BoS.

The Eastern BoS is the official canon name of the MWBoS.

Might be the "canon" name, but I've never used it as such. Just creates confusion. Western Brotherhood, Midwestern Brotherhood, Eastern Brotherhood: simple and straightforward.

It kind of made sense when there was no chapter that was settled further east. But now with the introduction of Lyons, the "Eastern Brotherhood of Steel" name for the Midwest is awkward and just flat out odd.

I have a dream, that one day all Brotherhood chapters will have their official canon designations line up with their general geographical approximation.

I can imagine the scribes over in Lost Hills trying to update all their records to make Lyons the Eastern BoS, while making the EBoS the MWBoS

"Ok guys, so, since Lyons went further east then the EBoS, and hes basically gone rouge and done his own thing, we decided that we are going to update ALL of our old records, and change the former EBoS's name to the MWBoS, and make Lyons the new EBoS"

*days later*

"Uhh Bob?

Yeah Tim?

Did you update these records over here already? I'm not sure if the Eastern BoS mentioned here is the MwBoS, or Lyons BoS

Uhh.... HEY! Does anyone here remember if they updated record block 16-5 to the correct naming format!?

*no one knows*

Well [censored].... uh.... just throw it in with the record section we use for Lyons, no one is going to care anyways!"

Ehhh... For once, I think this is a change I'd be okay with them just retconning in, instead of making an in-game explanation for. It's just semantics, anyway.

Or, they could rename the Midwestern Brotherhood by whatever name their Elder is. So you'd have the classic Brotherhood of Steel on the west coast, the Lyons Brotherhood on the east coast, and Whatsisname's Brotherhood in Chicago.

Maybe each Brotherhood chapter should name itself by the direct major location it is currently operating around, or regions depending on the uniformity of the chapters in the regions they're active in and how dominate they are there. So, Lyon's BoS would simply be the Capitol Chapter (Or we could keep call them the East Coast Brotherhood of Steel if the Prydwen is infact from Lyon's flock as they're able to project their their forces across the coast as a major power, or if they are just a different chapter being set up separately run but intimately-allied with the Capitol Chapter then we could just call them the Commonwealth Chapter while Lyons flock remains the Capitol Chapter), The West Coast would be the Lost Hills Chapter, or West Coast/New California Chapter if the chapters across the west coast are unified and obeying the same command chain. We'd also have the Mojave Chapter and the Chicago Chapter (if rumors of them being small and rogue are to be believed) At least then we can focus specifically on certain chapters in specific regions and areas.

The coast names also could work fine, but then at what point would that cease to be appropriate?

Even if the chapters across America are not allied in the sense of the word, they each derive their ideology, beliefs and culture from the original Roger Maxson's dogma and codex and the collective history and experiences of the organization, even if each chapter may have a different interpretation of what his words, their mission and the interpretation of the lessons these experiences taught them.

One of the confusing things about the use of Commonwealth in FO is that in the FO Universe the USA was broken into 13 different commonwealths, hence the change of the stars on the flag.

Also, it seems kind of odd to me to reintroduce an entirely new BoS chapter, all the way in the east. Which is why imo if it not Lyons BoS, it is the MWBoS. Doesn't make much sense to me for the WCBoS to send yet another expedition east, especially when they in a war, well, depending on the time the game takes place.