Master Sgt. Jennifer Thielke, 28th Maintenance Squadron first sergeant, looks at a thank you poster from her unit during a first sergeant surprise party at Ellsworth Air Force Base, S.D., Dec. 9, 2015. First sergeants are 24/7 special duty senior NCOs who provide a dedicated focal point for readiness, health, morale, welfare and quality-of-life issues within their organization. (U.S. Air Force photo by Airman Sadie Colbert/Released)
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