1. Currently receiving maintenance therapy with one or more long-acting bronchodilators, such as a long-acting muscarinic antagonist (LAMA; also known as a long-acting anti-cholinergic), long-acting beta 2-agonist (LABA), or inhaled corticosteroid (ICS)/LABA combination for the treatment of COPD. Subjects must be able to continue using their currently prescribed COPD maintenance inhaler therapy throughout the study and as needed short acting beta-adrenergic agonist (SABA) or short acting muscarinic antagonist (SAMA) for rescue use.