I dug up the manuals for Rules of Engagement II online.

I have uploaded them in several different ways, based on preference.
If there's any other way I can make it easier, let me know.

There are two manuals, that I could find. One is the base manual, the other is the builders manual, for creating missions, etc.

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7z Containing both manuals:
https://www.dropbox.com/t/UbI3AcMdgvHhaf78
Alt Link:
https://filebin.net/30re9znmbghln3ja
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Raw Base Manual Download:
https://www.dropbox.com/scl/fi/54kta0y2zgiqeqq3d54rl/Rules-of-Engagement-2_Manual_DOS_EN_HD-Scan.pdf?rlkey=2ga4ipqizt28qb59uef8oyk57&st=58h3vs68&dl=0
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Raw Builders Manual Download:
https://www.dropbox.com/scl/fi/z2htndpltsjbmlp62110r/RulesOfEngagementII-BuilderManual.pdf?rlkey=oarlxntv1sq6whw0a4nf9yilu&st=sfvkuob1&dl=0