The deer of Valley Forge have reduced their numbers on their own accord over the past five years.
Even where deer are numerous, it's an odd argument that insists humans need to be predators while all along we're treating the real predators as nuisance animals. Predators are vital to sustaining an ecological environment.
For example, the war on the coyotes in Pennsylvania, where they can be hunted down all year, has shifted the natural order.
In addition to bringing in the weapons, the National Park Service seeks to implement a contraception program, which may lead to the collapse of what's left of the park's White-tailed deer population.
Full article: http://www.anairhoads.org/animal/valleyforge.shtml