1-down
1 UP
1st Lieutenant (1LT)
2-down
2 UP
2nd Lieutenant (2LT)
3-D radar
360° fixed radar
3CF (three column format 1. Factor - What; 2. Deduction, Analysis / Implication – Why; 3. Output - So What)
3PL (third-party logistics)
4D logistics checklist (Destination, Duration, Demand, Distance)
4GW (fourth-generation warfare)
51mm mortar bandolier