According to the MJ ruling in a case I just completed in Korea, the Intoxilyzer SD2 is reliable if administered in accordance with its instruction manual and the applicable AR. However, at Camp Casey, Korea, they are not admissible. That is because the MP's do not conduct proper calibrations in accordance with the test instructions and AR on how Army breath tests are to be conducted. For the military judge this failure constitutes a major departure from the regulation and not a minor failure.
Note: this is a Joint regulation applicable to all of the Services:
AR 190-5; OPNAVINST 11200.5; MCO 5110.1; AFI 31-218(I)