This is ex USAAF 44-35708, which also served with the French AF for a few years in the 1950s as 435708. It became N5530V in 1963 and was converted to On Mark Marketeer and later used by Raytheon's Missile Division. Air Spray acquired it in 1976 and they largely undid the Marketeer conversion when they configured it as an airtanker. When this photo was shot it had just been sold to the Classic Aircraft Aviation Museum, and it was delivered to their Hillsboro, OR base in Oct 2006. It became N26PJ in Mar 2007.