54-0105 —

Appears to be the test bed Thud for the purposed RF-105. Great to see this air frame still exist and is being cared for at Lackland

Garrett Heller - you are exactly right! This Republic Thunderchief was originally ordered as a RF-105B but was reassigned the JF-105B designation for use as a test aircraft.

Joe Baugher's published documentation offers this...

"54-105 Republic JF-105B-1-RE Thunderchief originally ordered as RF-105B Now on display at USAF History and Traditions Museum, Lackland AFB, TX."

Mr. Baugher's information also indicates that 54-108 and 54-112 likewise were assigned the same type designation.

http://www.joebaugher.com/usaf_serials/1954.html

Wikipedia's online information confirms there were only three (3) JF-105B airframes built by Republic...

"JF-105B
Test aircraft built from re-allocated RF-105B airframes; three built.
RF-105B
Proposed reconnaissance version of the F-105B; none built. Three were ordered but completed as JF-105Bs."

https://en.wikipedia.org/wiki/Republic_F-105_Thunderchief

This Thunderchief at Lackland AFB is indeed a rare bird!