Limbo by Bernard Wolfe

In the aftermath of an atomic war, a new international movement of pacifism has arisen. Multitudes of young men have chosen to curb their aggressive instincts through voluntary amputation - disarmament in its most literal sense. Those who have undergone this procedure are highly esteemed in the new society.

But they have a problem - their prosthetics require a rare metal to function, and international tensions are rising over which countries get the right to mine it . . .