If these execs were experienced engineers that needed to be embedded in a unit in the field, maybe, and definitely not at O-5. Usually these sorts of urgently-needed experts become instructors and teach troops the specific technical skills without the need for being enlisted/commissioned/warrant themselves.
Someone more familiar with the political games inside the Pentagon will better understand this decision.
When outside the wire we would, of course, follow the directions of the army escorts because they were unequivocally in charge. The only time I can remember anyone chastising us was because we were getting overly aggressive in traffic up in the Kurdish region and there was an incident the previous day where some mayor's son had his engine block shot out so they were like, "you guys need to cut that shit out, these are our allies up here".