Today, these areas are normally designated as, or part of, historical sites.
They may include war memorials dedicated to veterans or statues of important figures in past wars, such as George Washington or the Marquis de Lafayette.
They may also include preexisting or rebuilt structures, or restored weaponry on static display, such as centuries-old cannons or outdated armored fighting vehicles.
Oftentimes, training fields are still used for public gatherings or as parks.
Other times, they may still be part of existing military installations.