The judgment of conviction in this selective service case is affirmed.

The charge was that he failed to keep his local board advised of his address so that mail could reach him (here a notice of induction) while he traveled around with carnivals.

Whether he made a good faith effort to keep the board informed was a question of fact which has been decided against him on sufficient evidence.

Here the defendant testified. Lack of belief of a witness often permits some affirmative inferences. In our view, this is just such a case. Such inferences may have buttressed up other evidence.