This brings us to petitioner's complaint that giving force and effect to the last clause of 772 (f) would impose an unconstitutional restraint on his right of free speech. This clause on its face simply restricts 772 (f)'s authorization to those dramatic portrayals that do not "tend to discredit" the military, but, when this restriction is read together with 18 U. In the present case Schacht was free to participate in any skit at the demonstration that praised the Army, but under the final clause of 772 (f) he could be convicted of a federal offense if his portrayal attacked the Army instead of praising it.