By derogation from the provisions of section 5.2.1.1 and 5.2.2.1 of ADR, explosive substances and articles of Class 1 belonging to the Armed Forces of a Contracting Party, that were packed prior to 1 January 1990 in accordance with the requirements of ADR at that time, need not be marked and labelled in accordance with ADR. In turn, they shall be marked and labelled in accordance with section 5.1.2.1 of ADR.