the use of military aircraft to provide protection against attack by enemy aircraft during ground or naval operations

the use of military aircraft to provide protection against attack by enemy aircraft during ground or naval operations

a minimally invasive operation to repair a damaged joint; the surgeon examines the joint with an arthroscope while making repairs through a small incision

a minimally invasive operation to repair a damaged joint; the surgeon examines the joint with an arthroscope while making repairs through a small incision