You know several people in your unit completed the approval process and are authorized to sign for receipt of CAT I ammunition. What is the lowest rank those individuals can be?

E5 level

Explanation:

The DA form 1687 of the United States is a form issued for the notice of delegation of the authority of the United States Army to receive the supplies. This is signatory card and is used for recording the supplies.

For the receipt of CAT I ammunition, the minimum or the lowest rank for the officer who is authorized to sign the form is of the level of E5.