Which 10-CODE corresponds to 'No traffic-security check reply'?

• A. 10-19
• B. 10-11
• C. 10-14
• D. 10-20

Answer: (A)

The action being tested is how to communicate a change in a unit’s status at a checkpoint when there’s no reply. In 10-code usage, returning to base or the station is the standard way to pause and report back when you aren’t getting a traffic-security check response. That makes sense here: if there’s no reply, the prudent step is to head back to base to reestablish contact and await further instructions. Other codes point to different in-field actions or statuses and don’t convey this retreat to base, so returning to base is the best fit for this situation.