Yes, is my answer, or at least that is my answer in a brief filed with the Army Court of Criminal Appeals and in several arguments at court-martial.
Under Mil. R. Evid. 801(2), you can offer the out of court statements of an opposing party or certain statements of that parties lawyer as evidence. Such evidence is not hearsay.
(d) Statements that Are Not Hearsay.
Court-Martial Trial Practice Blog

