Airmen selected for senior airman below the zone Published Dec. 21, 2009 PETERSON AIR FORCE BASE, Colo. -- The 21st Space Wing senior airman below the zone central base board for the fourth quarter was held Dec. 7. The following Airmen were selected for BTZ promotion between Jan. 1 and March 30, 2010: Airman 1st Class Sarah Bostwick, 21st Medical Support Squadron Airman 1st Class Delilah Alvarado, 21st Dental Squadron Airman 1st Class Daniel Kuertz, 21st Security Forces Squadron Airman 1st Class Shawn Hazen, 561st Network Operations Squadron The 721 Security Forces Squadron also conducted a large unit board Dec. 2 and two were selected for BTZ promotion: Airman 1st Class Katherine Wilcox, 721st SFS Airman 1st Class Stacy Phillips, 721st SFS