Quick glace at Joe's site and I got this -
54-2815 (MSN 217) built as VC-131D. Formerly on civil registry as N8448H. To USAF Dec 10, 1954. Converted to VC-131H (Model 580)
Transferred to US Navy Apr 1979 but retained USAF serial. Redesignated C-131H
when returned to USAF service. Then converted to VC-131H. To Peruvian Police as PNP-025.
Sold on civil market as N7146X. Became N723ES, cancelled
Nov 7, 2007 on sale to owner in Canada, registered Jan 17, 2008 to Ministry of
the Environment, Province of Saskatchewan as C-GSKQ
"Ministry of the Environment" is Saskatchewan's version of the Department of Forestry. The plane became one of their water bombers and is still in service.
54-2816 (MSN 220) built as VC-131D. Converted to C-131E. Converted to C-131H and then to VC-131H. Reported as crashed.
54-2817 (MSN 221) built as VC-131D, converted to VC-131H (Model 580). Transferred to US Navy Apr 1979 but retained USAF serial.
Returned to USAF service. Crashed on takeoff from Dothan, Alabama Nov 15, 1985. 4 killed.
55-299 (MSN 326) was originally MSN 230 but was cancelled. Was N8442H before USAF service. Converted to VC-131H.
Transferred to US Navy but operated under USAF serial number. With VR-48 in May 1988 named
"City Of Washington, DC." Returned to USAF. To N4276C, N923DR, N191FL Oct 29, 1998.
Original MSN 230 to civil registry as (CV-340-61) HZ-ABC (Saudia Arabian Airlines), then
N99875. Current as such on USCAR Oct 03) but converted to CV-580
and registered N191FL for IFL Group Oct 29. 1998
First and last have URLs on the serial number to their Aerial Visuals pages.