§ 21. Assistance to other states, the Dominion of Canada, property ceded to the federal government and to Indian reservations. 1. Whenever a fire company or fire 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 firefighters of such fire 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 firefighters; provided, however, that there shall be deducted from any amounts payable under this chapter any amounts recoverable by or payable to any such volunteer firefighter 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 firefighters of fire departments and fire 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 a fire department or fire company 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 firefighter shall be considered as a volunteer member of the fire department or fire 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 firefighters, fire departments or fire companies, or of the Dominion of Canada, as the case may be, contain provisions under which benefits are granted in relation to volunteer firefighters 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 firefighter of such other states or of the Dominion of Canada, any amounts recoverable by or payable to such volunteer firefighter under the laws of the state served by such volunteer firefighter or of the Dominion of Canada, as the case may be.

3. Whenever a fire company or fire 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 firefighters of such fire 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 firefighters.