UndeploySound

Flag:	UndeploySound
File(s):	Rules(md).ini
Values:	Strings (names of Sounds)
Default:	none
Applicable to:	InfantryTypes,VehicleTypes

Specifies the sound to make when this object undeploys. Should be set to a valid entry from SOUND.INI. Appears not to work on BuildingTypes which can undeploy, you should use the PackupSound= statement instead for those.
For VehicleTypes this tag will only work if used with the tag IsSimpleDeployer=yes

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NOTE: in Yuri's Revenge, none of those methods work - you can however use DeploySound= for such an object which can redeploy, and this sound will be used when it undeploys.