Flag of Greece Additionally, the flag may also be flown on days of national mourning, half-mast. The Minister of the Interior has the authority to proclaim flag days if they are not already proclaimed, and proclaiming regional flag days is vested with the elected head of each regional unit (formerly prefectures). Although 17 November is not an official national holiday, Presidential Decree 201/1998 states that respects are to be paid to the flag on that particular day. The War flag (equivalent to regimental colours) of the Army and the Air Force is of square shape, with a white cross on blue background. On
Flag of Greece other designs surviving until that time. No other designs and badges can be shown on the flag. To date, no specification of the exact shade of the blue colour of the flag has been issued. Consequently, in practice hues may vary from very light to very dark. The Greek Flag Day is on 27 October. The old land flag is still flown at the Old Parliament building in Athens, site of the National Historical Museum, and can still be seen displayed unofficially by private citizens. The use of the Greek flag is regulated by Law 851. More specifically, the law