ACCA has issued a Memorandum Opinion in United States v. Markis, ARMY 20070580 (A. Ct. Crim. App. 18 August 2009).
Appellant had given three pre-trial admissions to CID. The defense sought to exclude the confessions as being coerced. The military judge permitted the defense to present expert testimony on coerced confessions, specifically it appears how the Reid Technique may lead to coerced confessions. However, the military judge refused to allow the defense to ask hypothetical questions unless the defense first asked for an Article 39(a), UCMJ, session to get a ruling. It appears that the defense did not seek to ask a hypothetical and did not ask for an Article 39(a) once the prosecution witnesses had testified and they had laid a sufficient foundation to get to the point where a hypothetical might be offered.
The opinion has a nice little review of what you must do, by way of proffer, to preserve an objection.