(CNN) The U.S. military has moved some search and rescue assets into Northern Iraq, a U.S. official said on Wednesday.

The move was described as part of a constant rebalancing of search and rescue assets that are moved depending on the evolving airstrike mission. The source did not suggest it was a response to United Arab Emirates concerns about proximity of rescue assets and did not say when this latest rotation happened.

The reshuffling comes after news that UAE had suspended participation in coalition strikes out of concern that search and rescue assets were not placed close enough to ensure a timely effort to rescue, a claim disputed by U.S. military officials.

CBS News was first to report the adjustment.