First of all, what does your Post By Laws state on Check Signing?
MOP Section 218,
1, Commander, f. Approve all disbursements of funds properly authorized by the Post.
5 Quartermaster, c. Disburse funds as properly authorized by the Post using accepted banking practices. Unless otherwise provided for in Post By-Laws, all disbursements of Post funds shall bear the signature of the Quartermaster or other person(s) authorized by the Quartermaster. Such other authorized person(s) shall be bonded with an indemnity company as surety in a sum at least equal to the amount of the liquid assets for which he may be accountable in accordance with Section 703.
This is all the mention in the National By Laws as currently printed. So, it is your By Laws that will tell.