Hi guys.
These planes were war weary aircraft used as "Assembly Ships". Individual bomb groups had their own aircraft, normally the B-24 Liberator groups, and these were painted in bright colours and unusual patterns.
They took off first and then fired flares or flashed lights to enable the bomb groups aircraft to formate quickly and safely before they headed off towards their target. The assembly ship would then land.
This particular aircraft was known as the Spotted Cow and was the assembly ship of the 384th BG based at Grafton Underwood in Northamptonshire UK.
Nige