How do you know?
Seriously.
Do you know people who work at NASA?
Have you been to the space station?
Have you talked with, or interviewed, anyone?
Have you asked them - and those in charge - about their, so called, lies?
Somehow, I very much doubt it.
I think you're just repeating things that you have heard other conspiracy theorists/flat earthers saying - without any understanding, evidence or willingness to check the truth of these claims.
Employees at the National Aeronautics and Space Administration whose jobs require them to access sensitive information must pass a background check and receive a security clearance before they can start the job. Some jobs at NASA involve access to much more sensitive information than others, so there are different levels of security clearance depending on the position.
Do You Need a Clearance to Work at NASA?. Employees at the National Aeronautics and Space Administration whose jobs require them to access sensitive information must pass a background check and receive a security clearance before they can start the job. S
work.chron.com
There is nothing sinister about this. Some NASA employees work with the USAF, for example at Dryden Flight Test Center at Edwards AFB, which I visited once…amazing, but hot! Even for the desert. But Edwards is a paradise for test pilots, since the entire lakebed can be used as a runway, so aircraft can take off into the wind regardless of direction (although it also has a rather long paved runway that was used by the shuttle). Groom Lake (Area 51) and China Lake Naval Air Station are similar, indeed, Groom Lake is like a mirror image of Edwards, which was very useful when developing the U2 and A12/SR-71 (both of which NASA had flown). Also some NASA employees have safety critical tasks like base security and so on. Although the very important job of the Range Safety Officer who had the power to activate the Flight Termination System on the Space Shuttle, which would destroy the vehicles if they went out of control, was a USAF officer and not a NASA civilian.
As it happens this was done once, in the immediate aftermath of the fatal launch of Challenger in 1986: after the external fuel tank exploded and the SRBs were flying freely, they had to be destroyed using the FTS perchance they crash into South Florida.
Lest anyone should say the FTS caused the Challenger accident, this is not true, since the FTS would destroy all vehicles simultaneously and not leave the SRBs flying around willy-nilly.
It was rather a terrible tragedy due to gross incompetence, since the O-rings that bound the field joints in the SRB could fail in cold temperatures, a problem O-rings normally have, which resulted in a plume of hot exhaust gas escaping the SRB ahead of the nozzle and unfortunately hitting the external fuel tank, and burning through and igniting it. The external fuel tank when filled with liquid hydrogen and liquid oxygen was potentially a bomb, and that is what blew up in that tragic event.