The words are so often confused and / or mis-used in here..
The word commonly mis-used = ordinance
noun
1. law: a law or rule made by an authority, for example, a city government.
2. something prescribed: something regularly done because it is formally prescribed, especially a religious ceremony, such as Holy Communion ( formal )
The word meant in here 9 times out of 10 = ordnance
noun
1. military military weapons systems: military weapons systems, including supplies for their use and equipment for their maintenance
2. department responsible for weapons and supplies: the army or government department that has responsibility for military weapons and supplies.
.... Just Saying