Sounds like mainenance.
People point to civil aviation for safety statistics, and the record is really good. Engines are pretty reliable these days. They can run without problems for thousands of hours. Here's the discriminator. Civil aviation runs airframes and engines with huge safety margins built into the design. Military combat training and flight shrinks margin to gain performance, so the engines often see more heat, more stress, more wear and tear. I'd still rather have two engines over one.
Sounds like mainenance.
How so?