Tony Lynn Colin Head appeals the 18-month sentence imposed upon revocation of his supervised release. “This Court must examine the basis of its jurisdiction, on its own motion, if necessary.” Mosley v. Cozby, 813 F.2d 659, 660 (5th Cir. 1987). Head has served the sentence of imprisonment imposed upon revocation, and the district court imposed no further term of supervised release. Therefore, Head has no “concrete and continuing injury,” and there is no case or controversy over which this court may exercise jurisdiction under Article III, § 2, of the Constitution. See Spencer v. Kemna, 523 U.S. 1, 7, 14, 118 S.Ct. 978, 140 L.Ed.2d 43 (1998).

The appeal is DISMISSED as MOOT.