That just the way that the force generation rotation works. Training, High Readiness for short notice, Other Tasks (tours). Looks like it just fall into the cycle that way. Was the tour planned for a long time, or opportunity to make use of new capabilities.
Volunteer to go with them, some of them won't want to go away again so soon. Or just wait out and your turn will come soon enough. Don't believe me, check out the tours that the other btys in 1 Arty Bde have done. Once you pop you just can't stop!! (if you get my drift)