The overall exercise commander for Grand Slam was Admiral Robert B. Carney USN, NATO's Commander-in-Chief Allied Forces Southern Europe (CINCSOUTH).

[4] Blue naval forces were centered around the U.S. Sixth Fleet, under the command of Vice Admiral John H. Cassady, USN, and its two aircraft carriers, the Franklin D. Roosevelt and Wasp.

[4] Operation Longstep concluded with an amphibious landing at Lebidos Bay south of İzmir, Turkey, involving 3000 French, Italian, and Greek troops, including the Third Battalion, Second Marines, under the overall command of General Robert E. Hogaboom, USMC.

[4][7] In the actual landing at Lebidos Bay, the Italians went ashore at H-Hour minus six in a diversionary attack on nearby Doganbey Island.

After securing the beach-head and setting up a defensive perimeter, the landing force was re-embarked onto the amphibious shipping off-shore, concluding Exercise Longstep.