Editing Lockheed Model 18 Lodestar (section)

===US Navy Lodestars===
;XR5O-1
:One Model 18-07 acquired for evaluation powered by 1,200&nbsp;hp (895&nbsp;kW) Wright R-1820-40 engines.<ref name="Serials77" />
;R5O-1
:Staff transport powered by 1,200&nbsp;hp (895&nbsp;kW) Wright R-1820-97 engines; three aircraft built, two for the USN and one for the [[United States Coast Guard]] (USCG).<ref name=":0">{{Cite web |title=Lockheed R5O-1/4/5 "Lodestar" (1940) |url=https://cgaviationhistory.org/aircraft_/lockheed-r5o-145-lodestar/ |access-date=2025-01-13 |website=Coast Guard Aviation History |language=en-US}}</ref>
;R5O-2
:Navy version of the C-59 powered by 850&nbsp;hp (634&nbsp;kW) Pratt & Whitney R-1690-25 engines; one aircraft built.
;R5O-3
:Powered by 1,200&nbsp;hp (895&nbsp;kW) Pratt & Whitney R-1830-34A engines. Originally 4-seater VIP transports; three aircraft built.
;R5O-4
:Powered by 1,200&nbsp;hp (895&nbsp;kW) Wright R-1820-40 engines. Impressed. 7-seater staff transports; 12 aircraft built. The USCG acquired four in late 1942.<ref name=":0" />
;R5O-5
:Navy version of the C-60 powered by 1,200&nbsp;hp (895&nbsp;kW) Wright R-1820-40 engines. Similar to the R5O-4 but had 14-seats; 38 aircraft built and three former NEIAF aircraft.<ref name="Serials77" /> Three were acquired by the USCG in late 1942.<ref name=":0" />
;R5O-6
:Navy version of the C-60A for the [[US Marine Corps]], equipped with 18 paratroop seats; 35 built.<ref name="Serials77" />