The most experience I have working with Quality Assurance and Quality Control is when we replaced a non-nuclear valve on the submarine. They perform a cleanliness test on the valve before installing it. It was just a simple test where right before you install it, you use water and just some paper to see if there is dirt. If there was a certain amount of dirt then it would be cleaned until it passed. If it passed then it would then be installed on the submarine. There was tons of paperwork to document this including signatures and time and date when the valve was tested. This was all connected to the document that installed the valve. I didn’t perform the test. An official from the Quality Assurance and Quality Control department performed the test and I as the engineer on the job was just responsible for making sure the test was done and all the paperwork and procedures were correct.