sentences:  When Babylon 5 was brought into operation in 2257, Sinclair was selected by the Minbari to command the newly constructed station.He was selected over many more senior officers, including Colonel Ari Ben Zayn, all of whom had been vetoed by the Minbari (they had stipulated that they should approve the choice of Station Commander, as they had shared the cost of construction).In January 2259, Sinclair was reassigned as ambassador to Minbar, where he took command of the Rangers.