Navy Times staff writer Phil Ewing shares a fun update on the Scoop Deck blog today, and it falls squarely in the category of intra-service rivalry. The photograph above shows Marine Cpl. Brice Millier helping a patient in Guatemala last week as part of Operation Continuing Promise, a humanitarian and civic assistance mission in Central and South America that includes elements of the 26th Marine Expeditionary Unit, out of Camp Lejeune, N.C. You know, the same operation that caused breathless, moronic news reports saying that 7,000 Marines would be deployed to Costa Rica. In any event, Millier is photographed assisting…