sort by Rank | Alpha
| Possible Meanings | Rank |
| Observation and fields of fire - Cover and concealment - Obstacles - Key terrain - Avenues of approach | * |
| Observation of Fields of Fire, Cover and Concealment, Obstacles, Key Terrain, and Avenues of Approach | * |
| Observation, Cover, Obstacles, Key Terrain, and Avenues of Approach | * |