What is a primary factor in the deployment of SSNs and SSGNs?

The primary factor in the deployment of SSNs (attack submarines) and SSGNs (guided missile submarines) is the need to balance operational readiness with effective training and patrol cycles. This involves scheduling missions and maintaining a continuous presence in key areas while ensuring submarines are regularly cycled through training exercises to enhance crew proficiency and readiness.

In the context of military operations, it's critical that these submarines are prepared to effectively respond to emerging threats and conduct various missions, which requires them to be well-trained and capable of executing patrols. The intricacies of these cycles are designed to optimize the effectiveness of the fleet while also considering rest and recuperation for crew members and the technical capacities of the submarines.

While other factors such as political agreements, maintenance requirements, and technological upgrades are important considerations, the driving necessity for vigilance and capabilities in various mission scenarios makes patrol and training cycles paramount in operational planning and deployment strategies for SSNs and SSGNs.