Charles Chastain PromotedFT. BLISS. TEX. — Charles W. Chastain Jr.. 25, whose parents live in Belle Plaine, Kan., was promoted to Army private pay grade E-2 upon completion of basic combat training at Ft. Bliss, Tex., Feb. 23.The promotion was awarded two months earlier than is customary under an Army policy providing incentive for outs loading trainees. The promotion was based on his scores attained during range firing, high store on the physical combat proficiency test, military bear-