Final answer:
Random Antiterrorism Measures enhance an installation's security by creating unpredictability, which hinders potential aggressors' planning abilities. The exact effectiveness of RAM is difficult to measure, indicating that while beneficial, the impact isn't fully predictable.
Step-by-step explanation:
Random Antiterrorism Measures (RAM) introduce uncertainty into an installation's overall force protection program, which can hinder potential aggressors' ability to plan attacks. By varying the types, times, and intensities of security measures, RAM makes it difficult for adversaries to predict how and when they might encounter resistance or be detected. This unpredictability is a deliberate tactic to disrupt the planning cycle of threats, thereby increasing the security of the installation. The true extent of the effectiveness of RAM is difficult to quantify, as represented by the question mark in Figure 8.1 from the reference provided, indicating that while these measures are impactful, their precise impact is not fully known or predictable.