sentences:  Colonel Ben Zayn's investigation was one of several conducted by Earth Force Internal Affairs as the events on Mars were putting the command staff of colonies and stations in question.Ben Zayn's interest was not of investigation, but one of asserting control as he was passed over for command of Babylon 5 in favour of Sinclair by the Minbari, which did not sit well with Ben Zayn.Ben Zayn's true intentions were discovered by his Psi Corps Military Specialist Harriman Gray, as Ben Zayn is a close friend of Psi Corps official Alfred Bester.