are you asking/wanting to know How does VA reconstruct your  records?
yes
We submit a specific request to the NPRC for any additional service records they may have or can find for you
what do you provide?
We submit a specific request to the NPRC for any additional service records they may have or can find for you
How can I get the records I need to support my VA disability compensation claim?
are you filing a VA disability compensation claim
no
How does VA reconstruct my records?