Chief Master Sgt. Caesar Acosta, superintendent for the 149th Maintenance Group’s equipment maintenance flight, and Senior Master Sgt. Edward Serrano, assigned to the 149th Fighter Wing’s Maintenance Squadron, Air National Guard, headquartered at Joint Base San Antonio-Lackland, Texas, oversee daily flightline operations at Čáslav Air Base, Czech Republic June 20 during Sky Avenger 2018.  (Air National Guard

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