The Ministry of Defence paid out a record £100m in compensation to servicemen and women injured as a result of negligence last year.
The figures released by the National Audit Office showed that the largest single payout was £4m and went to a naval cadet who was injured after being ordered to jump into a canoe.
Ten years ago, the total bill for claims reached £25m.
The audit office warned of even bigger claims in the future relating to Gulf War veterans' illnesses and post-traumatic stress disorder.
These future claims could run into hundreds of millions of pounds, it said.