Helisdw made a good point when citing local geography. Having worked in remote areas of the US we found, that having a helicopter at their disposal, local first responders, would call the helicopter as a means of allowing for continued 1st responder support of their local areas. Using a ground transport would take them out of the local area for six to eight hours. The helicopter would be back in the area in 2 hours without a break in 1st responder coverage.