O_o, I restart the mission, I see Rifle Soldiers. It work fine. No more error.
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I remember now.
One month ago, I found a item about Red Alert 1. It is "Optimized *.mixs (v1) for Command & Conquer: Red Alert ".
It is Optimized by Sonarpulse .
I recover the file in my Ra 3.03. The allied 5B no more error get occur.
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the link :http://www.cnc-comm.com/community/index.php?topic=1612.0
The last file update is July 12, 2011
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Thank you Allen.