Dictionary Search Results Search for: Leave blank to see all terms (creates a very large page; please be patient). Options: Search only within terms. Exact matches only. Highlight hits in red. For a selection of basic naval terms, see the log and report glossary. Results: r4d-2-3-4 R4D-2-3-4abbreviation: "Skytrooper"; twin-engine Navy transport (VR(ML)), manufactured by Douglas