"I volunteer to try to fly this thing," said Maria, looking between the various sergeants and the techpriest. "I have some technical experience, and anyway I think I would be more useful as a pilot than directly engaging the enemy."
She wasn't entirely sure who she should be taking orders from; probably Sergeant Wexler, since he was in the guard as opposed to Sergeant McTavish who was a stormtrooper. But then, don't stormtroopers technically outrank the ordinary guardsmen? And what about the Techpriest? Techpriests were a common sight on her homeworld of Raikan III, since Raikan II was a minor forge world and Raikan IV was the home of the Red Talons chapter. The Mechanicus often requisitioned guard regiments for their own purpose, so following the orders of a Techpriest was practically second nature to her.
In the end, she figured she'd just let her superiors work it out amongst themselves. If their orders conflicted, she could get them to sort the chain of command out. If not, then there wasn't really a problem anyway, was there?