A suggestion....as this was a Secret Operational Squadron, I think your best bet will be to ask for the IDPFs on these individuals. To do so, please go to the top of this page and there will be a double row of sections across the top above the blue line. At the right side of the top row, is Research...click on that, and a window will appear, with directions and addresses to write to for the IDPFs....There is no known MACR in the available MACR database for March 20, 1944, with a loss for the 868th BS.
This tells me that the MACR was made out AFTER the war was over and those numbers are above the 14,000 series of numbers....one problem, is, that the MACR number has to be known in order to obtain a copy.
The recourse, is to request the individual IDPF for each individual. You should make the requests under the Freedom of Information Act, as you are not a relative.
It is possible
that the MACR number and the actual date of loss will be on the IDPF, and the circumstances surrounding the loss as well. IDPF stands for Individual Deceased Personnel File. MACR is the Missing Air Crew Report.
As the MACR is unknown, and the actual date of loss is suspect ,for at least two of the crew, and possibly the rest of the crew, ...the IDPF is the only answer at this time.....if the MACR number can be ascertained, then you can ask for it. This may be a lengthy wait, as the issuing agency is backlogged.
You do not say what your interest is in this crew.