Myanmar's military authorities have freed and deported a US activist jailed last month for three years. <br/><br/>Nyi Nyi Aung was arrested in September and convicted for forging an identity card, failing to declare currency at customs and violating immigration law. He had been a student activist in the 1988 uprising against military rule and had returned to Myanmar on a US passport. <br/><br/>In December last year, a group of 50 US lawmakers issued a joint call asking for him to be freed.<br/>