When did the Navy Jack officially replace the US Jack as a substitute?

The Navy Jack officially replaced the US Jack as a substitute on September 11, 2002. This change was made to honor the victims of the September 11 attacks and to demonstrate the Navy's commitment to the war on terror. The Navy Jack features a design that has become a symbol of resolve and perseverance in the wake of that tragic event. By adopting the Navy Jack for this purpose, the Navy aimed to convey a powerful message of solidarity and strength during a time of national crisis. The date of September 11 holds significant historical weight, making it a poignant choice for this substitution, reinforcing the Navy's role in the defense of the country and its values post-9/11.