Which statement best describes the difference between scheduled targets and on-call targets?

• A. On-call targets are engaged when detected and conditions are met; scheduled targets are pre-timed engagements.
• B. On-call targets are always preplanned; scheduled targets are discovered during operation.
• C. On-call targets are always unknown targets.
• D. On-call targets are engaged on a fixed schedule.

Answer: (A)

Engagements can be triggered in two ways: fixed schedule versus responsive to detection. Scheduled targets are pre-timed engagements set to occur at specific times or according to a calendar, regardless of what sensors or indicators show at that moment. On-call targets, by contrast, are activated only when detection occurs and the engagement criteria are met, making them contingent on real-time information and conditions.

So the best description is that on-call targets are engaged when detected and conditions are satisfied, while scheduled targets are pre-timed engagements. The other statements mix up which engagements are preplanned, discovered, or fixed, and don’t capture the responsive nature of on-call targets.