Conviction of defendant on four counts arising from intimate sexual activities in a national park and an ensuing physical altercation with United States Park Police Officers is affirmed, where: 1) it was proper for the district court to instruct the jury that defendant could have committed any of the threshold acts charged - not “assault” only - to be found guilty of an 18 U.S.C. section 111(a) offense, so long as the other elements of the offense were satisfied; and 2) the district court erred in admitting evidence of a subsequent crime under Federal Rule of Evidence 404(b), but given the overwhelming evidence from the underlying incident, there is no reversible error.