The Search and rescue team I am part of does not charge for a rescue, however, if the rescuer (or his/her family) wishes to donate something to the team, is is appreciated. But it is clear that a rescue must not be postponed or cancelled for monetary reasons.

Many SAR teams are self-funded. For example, in order to raise some funds, some volunteers in the team I am part of perform first-aid in local events.
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"The only easy day was yesterday."