If you DETACH something, it leaves something ...
If you ATTACH something, it joins something ...
Therefore, transferring this logic to temporary duties, you DETACH from your home unit, and you ATTACH to the receiving unit.
Therefore, if I was to go to RAF Boulmer for a course, I would be detached from RAF Scampton and attached to RAF Boulmer both at the same time!
As for the wording, it depends on whose point of view and how they wish to state it ....
RAF Scampton could say "attached to RAF Boulmer" or "detached to RAF Boulmer" the operative word being "to".
RAF Boulmer could say "detached from RAF Scampton" or "attached from RAF Scampton" the operative word being "from".
I guess I just succeeded in confusing myself now
