In the case of training a fighting force, doctrine of the enemy is often as beneficial to study. That does not mean stoicism is being promoted as the doctrine of either side, however.
Obviously stoicism makes a useful tool for someone who must endure the incredible hardship of soul that special operations must endure, however it's important to note that it is equally useful for the enemy to be just as resilient.
Stoicism is formally taught in the classroom to aspiring Navy SEALs; it’s probably capable of handling (necessary) violence