Okinawa off-base residents encouraged to complete OHA survey Published May 15, 2013 By 18th Wing Public Affairs KADENA AIR BASE, Japan -- Okinawa service members and spouses living off base are highly encouraged to participate in the 2013 Overseas Housing Allowance Utility and Recurring Maintenance Survey from now until May 31. The survey is available at http://www.defensetravel.dod.mil/site/oha-util-may.cfm. This survey is used to determine OHA utility allowances. Low participation numbers could negatively impact OHA rates in fiscal 2014.