2503

2503 was a year in the 2500s in the 26th century.

June

 * June 13: Admiral Harold Stanforth sends UNSC Transmission 08871D-00 to Preston Cole, informing him that his second wife, Lyrenne Castilla, is a high ranking Insurrectionist leader. Cole is given three hours to bring her in, but finds that she has already fled.

August

 * August 13: Ellen Anders is born on Arcadia.

Unknown

 * Jake Courage is born.