RAMP returing to the US

I've been trying to determine which ship my dad (Stalag Luft IV) was on when he was returned to the US.  He was in Camp Lucky Strike and from his 201 file I know he departed LeHavre on 15 June 1945 and arrived Newport News 20 June 1945.  I've checked the "http://troopships.pier90.org/1945.htm" and these dates don't correspond with any on the site.  Also, most crossings seem to have taken longer than 5 days.  Anybody out there with any ideas ?   I know the USS West Point made her final ETO trip sometime in June and is not in the database or could it have been a warship vice transport?  Just thinking of the quick transit time
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