Let's say I have a list that has Bossk, rHKs, and the Prey on the Weak Skirmish Attachment. When I deploy in the first round, I'm against a trooper list with a lot of 3 cost troopers, so I put the attachment on the HKs for the effect. In the next round, my opponent has no notworthy 3 cost or lower targets, so I attach prey on the Weak onto Bossk to better utilize it's effects. Is this a legal play? Are attachments tied to the deployment from start to end of the tournament, or do I have a choice when we deploy which deployment to attach to? Here's what the FAQ says regarding deployment and upgrades:

Some skirmish upgrade Deployment cards list the word “Attachment” above their abilities. These cards can be attached to other Deployment cards as follows:

• When deploying units during skirmish setup, if a player has one or more “Attachment” cards included in his army, he places each of these cards on one of his non-upgrade Deployment cards.

• Each Deployment card can have only one “Attachment.”

• Abilities on “Attachment” cards apply to all figures in the corresponding group.

• Many attachments require the group to have a specific trait, such as “Trooper.” Attachments with these restrictions cannot be played on a group that does not have the trait.

When a group with an “Attachment” card is defeated, the opposing player scores VPs equal to the deployment cost of the “Attachment” card in addition to the VPs he scores from the defeated group’s Deployment card.

I've checked the RRG, Tournament Rules, and FAQ and I can't seem to find anything that says that I can't.

Attachments are assigned when you deploy figures, i.e. during setup. You can't move attachments from one deployment card to another during the game. (Ah, got confused by your use of "round".)

There is nothing to suggest you could not choose a different deployment card to attach the skirmish upgrade attachement in the next mission in a tournament.

(You're listing which deployment cards you have in your army when you enter a tournament, not how they are assigned, right?)

Attachments are assigned when you deploy figures, i.e. during setup. You can't move attachments from one deployment card to another during the game. (Ah, got confused by your use of "round".)

There is nothing to suggest you could not choose a different deployment card to attach the skirmish upgrade attachement in the next mission in a tournament.

(You're listing which deployment cards you have in your army when you enter a tournament, not how they are assigned, right?)

Yes, on the tournament sheet you just list which cards are in your deployment, there isn't any indication that the upgrades are attached to a particular deployment. I'm pretty confident it is a legal play, but due to the way the RRG is written I have missed rules that are explained in weird sections, so I wanted to make sure it isn't written somewhere else that I'm not seeing.

I've wondered this in passing before but never stopped to find out an answer, and always just assumed intent of your list is your list from the beginning of tournament to the end (including which attachments are placed on which deployments). But there are no rules saying that you couldn't move attachments between games in a tournament that I can think of. This could be very interesting and it would let your example be more flexible. It'd be nice to have an official ruling, but I'd guess it really is fluid between games.

It was something I never really thought about, since in every tournament I've played I have played Imperial troopers. The only attachments I've run are Targeting Computer and Cross Training, neither of which were capable of moving to different groups in my list.

It'd be nice to have an official ruling, but I'd guess it really is fluid between games.

I think that there's a lot of things in regards to this game that would be nice to be see clarified in the rules, but I disagree that this is one.

There is nothing in the tournament rules that suggest that you need to permanently link upgrades to specific groups in your list when you sign into a tournament, so unless that was actually the intention, no ruling is needed.