Wis. Stat. § 322.061: Article 61 — Withdrawal of appeal.

(1) In each case subject to appellate review under this code, the accused may file with the convening authority a statement expressly withdrawing the right of the accused to appeal. A withdrawal shall be signed by both the accused and his or her defense counsel and must be filed in accordance with appellate procedures under ch. 809.

(2) The accused may withdraw an appeal at any time in accordance with appellate procedures under ch. 809.