In modern times, swords are not commonly used as primary weapons in military operations. The development of firearms and other advanced weaponry has rendered swords obsolete for most military applications. However, there are a few exceptions and ceremonial uses of swords in some modern militaries:

1. Ceremonial and Dress Purposes: Many militaries around the world incorporate ceremonial units that perform drills, parades, and other formal events. These units may include honor guards, military bands, or ceremonial guards who carry and display swords as symbols of tradition, honor, and historical significance. Examples include the Guard units in various countries, such as the British Guards regiments or the Tomb of the Unknown Soldier guards.
2. Officer Swords: In some military forces, particularly those with strong historical traditions, officers may wear ceremonial swords as part of their dress uniform. These swords are not intended for combat use but are symbols of rank, authority, and tradition.
3. Martial Arts and Combatives Training: While not widespread, some modern military personnel may receive training in various martial arts or combatives systems that include sword techniques. These training programs often focus on the development of discipline, physical fitness, and close-quarters combat skills. However, the use of swords in such training is typically limited to specific specialized units or programs.

It's important to note that the vast majority of modern military forces rely on firearms, explosives, and other technologically advanced weapons for combat purposes. Swords are primarily used in a ceremonial, symbolic, or historical context within the military today.