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This annual newsletter of the O'Callahan Society includes articles about the virtual 2020 annual meeting; guest speaker Rear Admiral Nancy Lacore, HC ’90; guest speaker General James N. Mattis, USMC (Ret), former Secretary of Defense (2017-2018) and Commander, United States Central Command (2010- 2013; In Hoc Signo Award recipient Jim Delehaunty; the death of Lester W. Paquin, founding member of the Society and Secretary of the Executive Committee; unit news, Captain Marv Carlin, USN taking command of the unit; alumni news); ongoing O'Callahan Society programs; publications; and a list of alumni buried in Arlington National Cemetery.