I agree with them that you need both to get awarded and can't believe this unit did you all like this as the 638 tells the story of your accomplishment.
Get your unit Commander to email the LTC that signed the certificate explaining situation. Their name is spelled out so you can use Global or AKO white pages to look them up. I'm sure the Battalion Commander will ensure his S-1 shop corrects this.
If you want email me the pdf certificate and I will help your CDR get in touch with the BN CDR, I'm at KAF.