
    UNITED STATES of America Plaintiff-Appellee v. Sean Tyree LEWIS Defendant-Appellant
    No. 17-2136
    United States Court of Appeals, Eighth Circuit.
    Submitted: March 1, 2018
    Filed: March 9, 2018
    Amy L. Jennings, Assistant U.S. Attorney, U.S. Attorney’s Office, Des Moines, IA, for Plaintiff-Appellee
    Sean Tyree Lewis, Pro Se
    Before GRUENDER, MURPHY, and SHEPHERD, Circuit Judges.
   PER CURIAM.

Sean Lewis directly appeals the district court’s judgment entered after he pled guilty to conspiracy to distribute a heroin, in violation of 21 U.S.C. §§ 841(a)(1), (b)(1)(C), and 846, and to being a felon in possession of firearms and ammunition, in violation of 18 U.S.C. §§ 922(g)(1) and 924(a)(2). Following careful review of the arguments raised in the brief filed by Lewis's counsel pursuant to Anders v. California, 386 U.S. 738, 87 S.Ct. 1396, 18 L.Ed.2d 493 (1967), we conclude (1) the district court’s findings with regard to the drug-quantity attribution and application of the aggravating-role, vulnerable-individual, and obstruction-of-justice adjustments were supported by the testimony at the sentencing hearing and were not clearly erroneous; (2) the determination that Lewis was a career offender did not affect his sentence; and (3) his sentence was not substantively unreasonable. Turning to Lewis’s pro se arguments, we find no error, plain or otherwise, with regard to application of the sentencing enhancement for his possession of a firearm, and no breach of the plea agreement by the government. Finally, having independently reviewed the record pursuant to Penson v. Ohio, 488 U.S. 75, 109 S.Ct. 346, 102 L.Ed.2d 300 (1988), we have found no non-frivolous issues for appeal. The judgment of the district court is affirmed, and counsel’s motion to withdraw is granted. 
      
      . The Honorable Robert W. Pratt, United States District Judge for the Southern District of Iowa.
     
      
      . We have assumed without deciding that, under the circumstances of this appeal, the arguments are not precluded by the appeal waiver. See United States v. Valencia, 829 F.3d 1007, 1012 (8th Cir. 2016), cert. denied, — U.S. —, 137 S.Ct. 838, 197 L.Ed.2d 76 (2017).
     