Valery Gerasimov, Chief of the Russian General Staff, turns 65 this year and is likely to stay on as long as Sergei Shoigu remains minister of defense. Gerasimov looms large over the current era of Russian military reform and modernization, though both processes were initiated by his predecessor, Nikolai Makarov. During his tenure, the Russian military has also been bloodied in two conflicts, Ukraine and Syria, with the lessons learned subsequently integrated into exercises at home. Gerasimov is more the representative of Russian military officialdom than...