>>533207A wire saw is made of steel that bends heavily as you use it. It only lasts x number of pulls and then it breaks, and you don't know what that number is. It may be useful for military, as chances are it will not be needed. If it is, there are most likely multiple wire saws available.
If you go /out/ and you know there is a high probability you will need a saw, you want a saw that dulls, not a saw that breaks.