So I've looked into it. It's just IVF reproduction where you take the eggs nucleus out and you put a sonomic cell in (any body cell). Bam, baby.
It turns out all the complications with Dolly were chance and a lot of 100% successful clones have been done of all kinds of species. It's not even that expensive to pull off.
It's just a matter of assuring that it's really safe for humans. Nobody wants to perform a medical procedure that results in a damaged child.
It's also interesting to note that most cloned animals are not very similar to the individual they were cloned from. Gene expression is a function of the maternal environment within the womb, and it will vary due to slight differences in the timing and intensity of various hormonal influences. The mother's immune system may also play a role.
So, sadly, we cannot really make an army of clones from our best warriors in a secret underground lab. We'd just end up with a wild pack of ordinary children, and with nobody nearby to help with babysitting.