ZCZC AA27 AVURNAV BREST 129/26 YEU SPECIAL OPERATIONS 1. FIRING EXERCISE FROM 070700 UTC APR 26 TO 071700 UTC APR 26 GUNNERY EXERCISES BY AIRCRAFT AREA WITHIN 40 NM RADIUS OF 46-50.00N 004-00.00W. 2. CANCEL AVURNAV BREST 126/26 3. CANCEL THIS MSG 071800 UTC APR 26 NNNN