An act, done with specific intent to commit an offense under this title, amounting to more than mere preparation and tending, even though failing to effect its commission, is an attempt to commit that offense. A person subject to this title who attempts to commit an offense punishable by this title shall be punished as a court–martial may direct, unless otherwise specifically prescribed. A person subject to this title may be convicted of an attempt to commit an offense, although it appears on the trial that the offense was consummated.