The USS "Phelps" along with the cruiser "Chester", escorted a vessel that served as the flagship for the commander of what?
USS Phelps (DD-360): USS "Phelps" (DD-360) was a World War II-era "Porter"-class destroyer in the service of the United States Navy. USS Phelps (DD-360):  In November 1936 "Phelps", along with the cruiser "Chester", escorted the heavy cruiser "Indianapolis" carrying President Franklin D. Roosevelt to Buenos Aires, Argentina for the opening of the Inter-American Peace Conference of 1936. USS Indianapolis (CA-35): USS "Indianapolis" (CL/CA-35) was a "Portland"-class heavy cruiser of the United States Navy, named for the city of Indianapolis, Indiana. USS Indianapolis (CA-35):  The vessel served as the flagship for the commander of Scouting Force 1 for eight pre-war years, then as flagship for Admiral Raymond Spruance, in 1943 and 1944, while he commanded the Fifth Fleet in battles across the Central Pacific in World War II.
Scouting Force 1