Halo: The Fall of Reach Ch 27

Mjolnir Shielding tanks 30 mm rounds:

	Along either side of the course there was something new: three 30mm chain-guns mounted on tripods.
...
	Two more grenades and the automated guns were out of commission. He noted that his shields had dropped by a quarter. He watched the status bar refill. He hadn’t even known he had taken hits. That was sloppy.

Mjolnir Shielding tanks 50 mm rounds:

	“I just accessed SATCOM,” she said. “I’m using one of their satellites so I can get a better look at what’s happening down here. There’s a SkyHawk jump jet from Fairchild Field inbound.”
	He stopped. The automatic cannons were one thing—could the armor withstand air power like that? The SkyHawk had a quartet of 50mm cannons that made the chain-guns look like peashooters. They also had Scorpion missiles—designed to take out tanks.
...
	In the blink of an eye, the dot had wings and the Master Chief’s thermal sensors picked up a plume of jetwash. In seconds, the SkyHawk closed—then opened fire with its 50mm cannons.
	He jumped.
	The wooden poles splintered into pulp. They were mowed down like so many blades of grass.
	The Master Chief rolled, ducked, and flattened himself on the earth. He caught a smattering of rounds and his shield bar dropped to half. Those rounds would have penetrated his old suit instantly.