Ralph Steinhardt was a member of the Special Engineer Detatchment (SED) at Los Alamos during the Manhattan Project.
Ralph G. Steinhardt, Jr.
Special Engineer DetachmentLos Alamos, NM
Manhattan Project VeteranMilitary VeteranSpecial Engineer Detachment
![](https://ahf.nuclearmuseum.org/wp-content/uploads/2017/08/steinhardt-ralph_g.gif)