Fall of Reach - Mjolnir Shield Dura

The three remaining Marines opened fire—spraying bullets in a full-auto fusillade. Bullets pinged off the Master Chief’s shield. The shield status indicator blinked and dropped with each bullet impact—the sustained weapons fire was draining the shield precipitously. John tucked and rolled, narrowly avoiding an incoming burst of automatic-weapons fire, then sprang at the nearest Marine

- Halo: The Fall of Reach, Chapter 27