Sometimes tactical pants do not come with ankle ties, such as these 5.11 Stryke pants (available at Amazon: http://amzn.to/2C65epi). Sometimes it is good to have ankle ties, such as when your inseam measurement is quite a bit shorter than the inseam of your pants or when keeping things from entering your pants via the ankle openings is desired.
Stay tactically tight around the ankles, my fellow Steemians!