STAFF Sergeants (SSGT) Steven Schreiner (left), USAF, and Shari Marsh, Refueling Squadron (ARS), 155th Air Refueling Wing (ARW), Nebraska Air National Guard (NEANG), ensure a KC-135R Stratotanker is mission ready. Air National Guard units have performed various functions whenever needed to relieve heavily tasked active-duty units supporting Bosnia Peacekeeping efforts