§ 21. Assistance to other states, the Dominion of Canada, property ceded to the federal government and to Indian reservations. 1. Whenever an ambulance company or ambulance department in this state shall answer a call to furnish assistance to any political subdivision or territory of another state of the United States or of the Dominion of Canada, or property ceded to the federal government, the provisions of this chapter shall apply with respect to the volunteer ambulance workers of such ambulance company or department, while such assistance is being rendered or while going to or returning from the place from where the assistance is to be or was rendered, to the same extent and in the same manner as if such service had been rendered in or for the area regularly served by such volunteer ambulance workers; provided, however, that there shall be deducted from any amounts payable under this chapter any amounts recoverable by or payable to any such volunteer ambulance worker under the laws applicable in the political subdivision or territory for which the call for assistance was made.

2. The provisions of this chapter shall apply with respect to volunteer ambulance workers of ambulance departments and ambulance companies of other states of the United States and of the Dominion of Canada who render service in this state in answer to a call for assistance to the territory regularly served by an ambulance department or ambulance companies described in subdivisions one to five, inclusive, of section thirty of this chapter and, for the purposes of determining liability for benefits under this chapter, any such volunteer ambulance worker shall be considered as a volunteer member of the ambulance department or ambulance company of the territory for which service has been rendered in this state pursuant to a call for assistance; provided that the laws of the state served by such volunteer ambulance workers, ambulance departments or ambulance companies, or of the Dominion of Canada, as the case may be, contain provisions under which benefits are granted in relation to volunteer ambulance workers of this state who are killed or injured when rendering service in such other states, or the Dominion of Canada, as the case may be, in answer to a call for assistance; provided, however, that there shall be deducted from any amounts payable under the provisions of this chapter to a volunteer ambulance worker of such other states or of the Dominion of Canada, any amounts recoverable by or payable to such volunteer ambulance worker under the laws of the state served by such volunteer ambulance worker or of the Dominion of Canada, as the case may be.

3. Whenever an ambulance company or ambulance department in this state shall answer a call for assistance to be rendered to any part of an Indian reservation the provisions of this chapter shall apply with respect to the volunteer ambulance workers of such ambulance company or department, while such assistance is being rendered or while going to or returning from the place from where the assistance is to be or was rendered, to the same extent and in the same manner as if such service had been rendered in or for the area regularly served by such volunteer ambulance workers.