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HELP ME TO KEEP MY SANITY.
Your thread is actually in the wrong area and the title of the thread doesn't match the game you are asking about.
You would perhaps fare better if you had posted here:
Game Chat
However, if you are talking about the first MoH and the level to take out 3 mortar positions, then all I can remember is that it was very glitchy on the PC and did infact require a few playthroughs to hit the right sequence for the cut-scene to activate and end the level!
You might also consider viewing this:
MoH Walkthrough. The level you need is called 'Gunfighters'
HELP ME TO KEEP MY SANITY.