WITH U.S. FORCES IN AL ASKA — Pvt. Joe A. Dujka, son of Mr. and Mrs. Joe Dujka, Rt J. Wallis, recently arrived at Fort Richardson, Alaska, for duty with the 68th Anti-Aircraft Ar tillery Group. Army units stationed in Alas ka undergo intensive field train ing while providing a defense force for the northern approach es of the U.S. and Canada, Private Duska, who received basic training at Fort Bliss, Tex as, graduated from Orchard High School and was self-employed as a farmer before entering the Ar my in April.