For example the transition of melee weapons to guns, a slow but sure transition, wouldn't that be a change.
Also how about stategies or tactics, such as Sun Tzu's art of war, it changed the strategies. What he wrote is still used today.
Or how about armor, to put it simply it was less in the bc's then it grew more into the ad's then it was less with the creation of guns, and even less getting towards today, and now it is more again with bullet proof vests.
So wouldn't something like "The basics of war never change" be more appropriate. Clearly not as catchy, but I think it is more accurate.