Guernsey's ambulance service could face a funding crisis as the gap between States funding and running costs grows.
The grant covers about 70% of the costs, but the chief ambulance officer said pressure to meet the shortfall was increasing year on year.
Last year marked the 70th anniversary of the St John Ambulance and Rescue Service in the island.
As well as its emergency role, it carries out cliff rescues and operates the marine ambulance, Flying Christine.
Guernsey's total health expenditure has risen by 46.6% over a 10-year period since 1996.
No one at the States Board of Health was available to comment.