It’s the same paper (the green bamboo-ish thing) as the short form which everyone has already seen. It is not old paper.It's not even that; open that WH.gov docuemnt in a PDF editor ...
It's a WATERMARK applied in the pdf file ...
Note: That 'pattern' does not curve with the document itself ...
Copier paper with green hashes is even easier to produce that result. Put book (white paper, no hashes) on copier. Make copy using paper with green hashes.
Any thought as to why the watermark was added? I can't think of a reason myself.
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Send treats to the troops...
Great because you did it!
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