origin of 'sad sack' (an inept blundering person)

USA, 1942, Army slang—popularised in the Army weekly ‘Yank’ by ‘The Sad Sack’, a cartoon strip by George Baker, depicting the misfortunes of an inept private

Adult Recommendations Ela Area Public Library

nanowrimo - Reluctant Habits

Are we a stupid people? By one of them : Weld-Blundell, Charles Joseph : Free Download, Borrow, and Streaming : Internet Archive

Daredevil – Now Read This!

The Sad Sack During World War II ~ Vintage Everyday

George Baker and the Sad Sack - The Comics Journal

Floating Feature: Cry 'Havoc' and let slip the stories from Military History : r/AskHistorians

Who was the most inept Allied commander in World War II? I have read that Field Marshal Montgomery made a lot of mistakes. Are there other commanders who made many mistakes?

Author: Adrian Bonenberger - Wrath-Bearing Tree

George Baker and the Sad Sack - The Comics Journal

Darwin, Francis & Seward, A. C. eds. 1903. More letters of Charles Darwin. A record of his work in a series of hitherto unpublished letters. London: John Murray. Volume 1.

One Man And A Thousand Tigers : Colonel Kesri Singh : Free Download, Borrow, and Streaming : Internet Archive