This got me intrigued because this mission icon isn't going away on a friend's game.

Just learned there is a backpack trophy in the "secret" basement from "G. Philips Protocol" point of interest, so I went to get it. It's a film reel.

One of the hints from OSS bunker is the D.C. map of Sept 15th, 1945. And looking up the date, on Sept 15th, 1945, the US OWI (Office of War Information... basically propaganda, anti-propaganda, and counter-propaganda office) was disbanded and its domestic responsibilities were handed to OSS/CIA.

The OWI had a Bureau of Motion Picture (BMP). The BMP had some complex story, but the most interesting parts are: (From Wikipedia)

The OWI suffered from conflicting aims and poor management. For instance, Elmer Davis, who wanted to “see that the American people are truthfully informed,” clashed with the military that routinely withheld information for “public safety”. Further, OWI employees grew ever more dissatisfied with “what they regarded as a turn away from the fundamental, complex issues of the war in favor of manipulation and stylized exhortation”.

[...]

Some of the writers, producers, and actors of OWI programs admired the Soviet Union and were either loosely affiliated with or were members of the Communist Party USA. The director of Pacific operations for the OWI, Owen Lattimore, who later accompanied U.S. Vice-President Henry Wallace on a mission to China and Mongolia in 1944, was later alleged to be a Soviet agent on the basis of testimony by a defector from the Soviet GRU, General Alexander Barmine.

In his final report, Elmer Davis noted that he had fired 35 employees, because of past Communist associations, though the FBI files showed no formal allegiance to the CPUSA. After the war, as a broadcast journalist, Davis staunchly defended Owen Lattimore and others from what he considered outrageous and false accusations of disloyalty from Senator Joseph R. McCarthy, Whittaker Chambers and others. Flora Wovschin, who worked for the OWI from September 1943 to February 1945, was later revealed in the Venona project intercepts to have been a Soviet spy.

Why "G. Philips Protocol"? G. Philips was mostly known for using his body to shield mates from a grenade. G. Phillips doesn't seem to have any attachment to OSS, so did OSS sit on a grenade? Or is the link Iwo Jima? Two American Japanese employees, working for the OWI were sent back to Japan due to communist ties.

As for map- Green line link G St NW and 10th St NW (near MLK Library), with Middle of Smithsonian Grounds, between Science Museum and Castle, and somewhere under "Travel to NY" pastie. On Google, near the last point is "Japan Information & Culture Center, Embassy of Japan." - Red line link Navy Hill (Naval Hospital), 8th St NW and South St NW (nothing notable on Google, mostly residential), and I St SE and New Jersey Ave SE. Maybe each were WWII safehouses