Maryland Code, Election Law § 5-402

(a) Upon request, a candidate who pays a filing fee is entitled to a return of the filing fee upon the filing of the certificate of withdrawal on the form prescribed by the State Board if the candidate enters into active duty with the armed services of the United States during the period between the last date allowed for the withdrawal of candidacy and the printing of the ballots.

(b) Subject to the approval of the State Board, the filing fee paid by a candidate may be returned to the candidate for good cause.