Naval air base, Corpus Christi, Texas. It's an intricate operation installing a 30-caliber machine gun in a Navy PBY plane, but not too tricky for Jesse Rhodes Waller. He's a Georgia man who's been in the Navy five and a half years. At the naval air base in Corpus Christi, Texas, he sees that flying ships are kept in tip-top shape. Waller is an aviation ordnance mate