The Art of the Balanced Party
The minute you can engineer soldiers, traditional military doctrine goes up, up, and away. So you turn to the myths and hope they are right.
You build tanks with exoskeletons. Snipers with cyborg eyes. You make sure you have backups so your idealistic good-looking squad leader only stays dead for a short while. You find traumatized, paranoiac orphans, fill them up with experimental nootropics and military-grade amphetamines, and make very sure they get all the therapy you need them to and not a bit more than that.
You tell yourself it's makeshift and marketing. They won't go on quests. They won't be fighting supervillains. All the secrets and tools you're gathering, all your hidden plans: that was how history always happened. The normal world remains.
A world, you increasingly fail to avoid noticing, would be easy to rule with all the power you could have...