brianleb parent
A super majority is a specified proportion that is in excess of a simple majority (e.g., where a simple majority would be 51%, a super majority might be defined as 60%). Per your link (which is admittedly interesting), military/defense only accounts for about for 770k of 2.2M full time federal employees. That is not a super majority, that is a plurality (the single largest group but not a majority).
The supermajority is in reference to both military/defense, though I could see how that could be very confusing wording with the "military-defense" category also on that site. The difference being non-military level defense numbers were not included in your calculation of the pularality. Non military defense also at least includes Department of Homeland Security, for example. Between those two you've already left plurality for majority. To get to the supermajority you need to bring in the department of veterans affairs. Note these 3 compose the top 3 offices in terms of employment.
Now I suppose you could argue the latter as bureaucracy as it's not direct defense but even then it's sole purpose is to provide lifelong healthcare support and benefits for the military personnel figure, not just random bureaucratic growth. Since that site didn't actually categorize the types of office, this reference includes similar defense categories as I listed above (though it also includes the Department of Justice, so gets a slightly higher percentage than my mind at the low 60% area): pdf warning https://ourpublicservice.org/wp-content/uploads/2022/03/FedF...