Thousands of Army Reserve soldiers are being forced to scramble for new assignments after the service abruptly ordered the dismantling of its helicopter units, a sweeping move that has caught commanders off guard and upended aviation operations across the country. The cuts, which are set to eliminate all of the reserve's helicopter units by the end of the summer, are part of Army Chief of Staff Gen. Randy George's broader push to modernize the force by shedding legacy formations and redirecting