put one's life on the line

How much does it cost to put one's life on the line for one's country?

The slight tension of putting one's life on the line (even if under these most actuarially positive of conditions, riding a plane that has never once crashed)?

Although Clamp often writes romantic works, Ohkawa has mentioned that she feels that it is more putting one's life on the line than love that causes women to grow or change.

There is a social benefit to being looked upon by one's friends, neighbors, acquaintances, as a kind of moral hero who is willing to put one's life on the line to benefit somebody else."