Software Deloper A/B Resume

Not long ago I was looking for a new position. I am a software engineer. I was not getting many hits at first and I suspected the reason was my resume. I tried the A/B approach to find what configuration of my resume worked best. To my surprise I got much better results with a configuration of my resume that omitted my military experience, my MBA, and my risk management training/certs - leaving only my 12 years of software development experience and Comp Sci education (my 'B' resume). I had overwhelmingly more hits with my B resume, subsequently did some code tests, and landed a position.

Does anyone have any theories as to why that happened? In both cases the resume was concise with a one page configurations or a two page configuration. The formatting didn't seem to matter only the above mentioned omissions.