No, *ORDINANCE* is laws or local regulations. *ORDNANCE* is military hardware or that support arm of the service which maintains, repairs and develops such military equipment.
FYI, American Artillerist and second Secretary of War Henry Knox was a private civilian artillery operator at the time of the Revolutionary war, a hobbyist and ballistics researcher. Accordingly he is now known as The farher of the American Artillery Arm
Thanks for the correction ... Duh-oh! ;)