There is no obligation for the person to be under oath. The plea procedure was established in United States v. Care, 18 U.S.C.M.A. 535 (1969)
There, the Court held that "we think that a plea of guilty may meet required standards if on the basis of the whole record the showing is clear that the plea was truly voluntary, even if the trial judge has not personally addressed the accused and determined that the defendant possesses an understanding of the law in relation to the facts."
Until 1984, military practice precluded placing an accused under oath during inquiry into the providence of his guilty pleas. The rationale of this practice was that an oath might "have a dampening effect" on the colloquy between an accused and the military judge which is necessary in establishing the basis for a plea of guilty. United States v. Simpson, 17 U.S.C.M.A. 44, 46, 37 C.M.R. 308, 310 (1967). In military practice -- unlike the rule in many courts, see North Carolina v. Alford, 400 U.S. 25, 91 S. Ct. 160, 27 L. Ed. 2d 162 (1970) -- a plea of guilty cannot be received unless it has a factual basis. United States v. Care, 18 U.S.C.M.A. 535, 40 C.M.R. 247 (1969). Thus, it is especially important that the accused speak freely so that a factual basis will be clearly established in the record.
In Simpson, we concluded that to take sworn testimony from an accused during a providence inquiry was inconsistent with the free flow of information between him and the law officer and so was "contrary to the spirit of the inquiry." 17 U.S.C.M.A. at 46, 37 C.M.R. at 310. Likewise, references to such information in the argument on sentence were held to be improper. United States v. Richardson, 6 M.J. 654, 655 (N.C.M.R.1978), pet. denied, 6 M.J. 280 (C.M.A.1979).
On August 1, 1984, the military practice that then existed was changed by the Manual for Courts-Martial, United States, 1984, to require that an accused who proffers a plea of guilty respond under oath to the inquiry of the military judge. R.C.M. 910(e), Manual, supra, the rule mandating the oath, also provides for prosecution of an accused who makes a false statement during the providence hearing. R.C.M. 910(c)(5).
Nevertheless, the Army Court of Criminal Appeals has held that it is not reversible error, even after the rule change, not to place the accused under oath. United States v. Riley, 35 M.J. 547 (ACCA 1992). The Navy/Marine Corps Court of Criminal Appeals has agreed with this position that it is not a violation of the Defendants rights not to obtain the plea and admissions under oath. The requirement of an oath during the plea colloquy is "not designed to benefit an accused, but to subject an accused to the possibility of a perjury prosecution for false testimony rendered in the providence inquiry." United States v. Midlam, 2005 CCA LEXIS 150, NMCCA 200101884 (May 6, 2006).
Shorty: I have told you again, and again, and again that the fact that you were not sworn does not make any difference as to whether or not your guilty plea was lawful. I've now provided all of the military case law available on the subject in support. I WILL NOT address this situation again with you. You've been given the answer. Asking again and again does not change what the correct answer is.
The fact that you were not placed under oath does NOT affect the validity of your guilty plea.
-badapple, COL, JA, USAFR