After looking over the code, it doesn't appear that the astronaut/cosmonaut Endurance attribute is ever used. The game tracks it, it's one of the two visible attributes when recruiting, and you can send 'nauts to Advanced Endurance Training to increase it. If only that meant something.

Since I don't like the idea that astronaut endurance is a potential trap in the game with no benefit, I propose it should have a benefit. An easy change to make would be applying it as a bonus on Duration tests, using the (minimum/average/max) of the crew's Endurance as a bonus much as the Capsule trait applies to piloting tests. Another suggestion is that it could have an impact on determining if a recruit is a physical washout.

Thoughts?