Tech. Sgts. Dave Thomas and Derek Boston of the 191st Maintenance Squadron at Selfridge Air National Guard Base, Mich., work on the pilot seat of an KC-135 Stratotanker during an isochronal inspection September 28, 2018. Isochronal inspections are required scheduled maintenance on aircraft systems after a scheduled number of flight hours and can last from six to eight weeks.

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Keywords: air, america, archive, armed, army, defence, force, forces, military, navy, reportage, service, serviceman, servicemen, soldier, states, united, usa