rules exist to keep married couples at the same station if they are permanent government servants. they are facilitated owing to service exigencies.yours husband can confirm his departmental rules about posting at the same station with spouse.but keep in mind neither establishment division will give you posting of datta khel in railway ,OMG or IRS, nor your husband can be posted with you on each assignment abroad in FSP.my point here is it depends on certain conditions and both of yours service exigencies.
regards