Which group is primarily responsible for registering for selective service?

The primary responsibility for registering for selective service falls on men, as outlined by the Military Selective Service Act in the United States. All male U.S. citizens and male immigrants, including non-citizens, are required to register for selective service when they turn 18. This requirement exists to ensure that the government can quickly mobilize a reserve of individuals available for military service if necessary.

While women play a significant role in the military and have been involved in various capacities, the legal obligation to register for selective service has historically applied only to men. This distinction highlights the specific regulatory framework concerning military conscription and service, reinforcing the idea that selective service registration is a male-specific mandate under current law. This is why the answer indicating that men only are responsible for registering is the correct choice.