The "Defense" section of teh "Air News" column in the April, 1940, issue of Aviation includes a news clip without photo:

Delivery Begins On P-38s

The United States Army will shortly receive its first unit of a $10,000,000 order for the fastest interceptor pursuit planes in the world. Lockheed, despite record foreign military orders and large commercial orders, is ahead of schedule on delivery of the new P-38 type fighters to the US Army Air Corps. This is the plane which won Army approval last year following a record transcontinental flight which proved the plane capable of extended operations at speed above 400 mph, the elapsed time being 7:45:36.