The adjutant general is authorized to make application to the National Guard Bureau for federal funds to assist in carrying out the survey, planning and construction activities herein provided. If any such federal funds are delivered to the state for disbursement, such funds shall be delivered to the state treasurer and by him deposited in the armory construction fund hereinafter created. Such funds are hereby appropriated to the adjutant general for expenditure for carrying out the survey, planning and construction activities. Any federal funds received and not expended for such purposes shall be refunded to the treasury of the United States.