Several of the Aimpoints will last 3-4 YEARS continuous operation.
Look on Aimpoints website and read the specs.
Don't expect that from a Wal-Mart "el cheapo" though.
History fails to record a single precedent in which nations subject to moral decay have not passed into political and economic decline. There has been either a spiritual awakening to overcome the moral lapse, or a progressive deterioration leading to ultimate national disaster.
If you think a strong military is expensive, think about what a weak one would cost