Place the Normandy_US.RFA file in your BF levels directory.

For instance, if you have BF1942 installed to this directory:

C:\PROGRAM FILES\EA GAMES\BF1942

Then you would place the file in this directory:

C:\PROGRAM FILES\EA GAMES\BF1942\MODS\BF1942\ARCHIVES\BF1942\LEVELS

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Once you have done that, load up BF1942 and the level should now appear in your list of levels for
conquest maps.

- Sam -