Uniform Code of Military Justice
Article 50. Arraignment and Pleas.
(a) An accused shall be arraigned upon each charge and specification referred for trial.
(b) An accused may plead—
(i) guilty; or
(ii) not guilty.
(c) A guilty plea shall not be accepted unless the Military Judge determines that the plea—
(i) is knowing;
(ii) is voluntary;
(iii) is supported by an adequate factual basis; and
(iv) is entered with an understanding of the offense and material consequences of the plea.
(d) When an accused refuses to plead, a plea of not guilty shall be entered.