[Alas Babylon!]

He could be compelled to appear but could also refuse to answer specific questions claiming his Fifth Amendment rights.

[driftdiver]

Seems like it would be pretty easy to get any military member to appear. Give them an order and they show up. Perhaps their commanders are preventing them from appearing???

I read it as they are appearing but aren’t saying what he wants them to. Perhaps he should write their testimony out for them. That seems to be what he wants.