Why does a bugle play the last post at the beginning of the service and reville later in the service?

The bugle plays "The Last Post" at the beginning of a memorial service to honor and remember those who have died, symbolizing the end of their day's journey and their sacrifice. "Reveille," played later, signals the awakening of the living and a call to action, reminding attendees to reflect on life and continue forward with purpose. Together, these musical signals create a poignant contrast between remembrance and renewal.