Airman 1st Class Chrisdien Scarlett, an A-10 Thunderbolt II crew chief with the 25th Aircraft Maintenance Unit, wears his bump cap at Osan Air Base, South Korea, Wednesday, Aug. 28, 2019. OSAN AIR BASE, South Korea — The 51st Fighter Wing’s safety office came up with a simple and, it hopes, a popular solution to a problem that plagues aircraft maintainers across the Air Force. From 2015 to 2017, Air Force maintainers reported 802 on-duty injuries from striking their heads on aircraft or weapons — injuries that cost the service nearly $2.5 million in medical care and impacts on combat capability, according to data provided by the wing safety chief, Maj. Philip Budenbender. The Air Force tried a prototype “bump cap” — an adjustable cap embroidered with the Air Force logo and fitted around hard-shell dome — to protect the user’s head. Bump caps, which provide some protection from minor bumps but not as much as a hard hat, are available in the civilian world. “Airmen said it was cumbersome, obstructed views,” Budenbender said Wednesday, “but, overall, people were just not too keen on the idea of wearing this type of hat.” The wing’s flight safety noncommissioned officer, Master Sgt...