... I wonder if the aircraft are being insured commercially or whether the government is offering some form of indemnity.
ITT Schedule 7.6, Required Insurances:
Part 1
1. Property Damage "All Risks" Insurance
2. Third Party Public Liability Insurance
3. Motor Vehicle Insurance
Part 2
1. Aircraft Hull "All Risks" Insurance
2. Aircraft Hull War Risks Insurance
3. Aviation Liability Insurance (including Products Liability)
4. Errors and Omissions Liability Insurance for Paramedics