Personal shields do, but they have less area to cover. Think kinda like ancillary, ablative or ERA Armour, once its wrecked you need to put on a whole new layer.
In Fall of Reach Keyes lowers the shields on the covvie Supercruiser multiple times and it turns back on each time.
The first round struck the Covenant ship; its shields rippled. The second and third rounds struck, and
more than five hundred missiles detonated along her length. Flame dotted the massive vessel, and her
shields blazed solid silver. They faded and popped. A dozen missiles impacted her hull and exploded,
scarring the bluish armor.
“Minimal damage to the target, sir,” Lieutenant Hall reported.
“But we downed their shields,” Captain Keyes said.
So the shields are down at this point.
{some lines later}
“Fire when ready, Lieutenant Hikowa,” Captain Keyes ordered.
“Firing!” Thunder rumbled belowdecks. “MAC rounds away.”
The shells struck the Covenant vessel; Archer missiles impacted . . . only a handful got though her
downed shields.
“Cortana, crash-land our Longsword on that bastard. Set timer delay on the nuke for fifteen seconds.”
“Afterburners on,” Cortana replied. “Impact in three . . . two . . . one. She’s down, sir.”
ThePillar of Autumn sped past the Covenant ship.
{skip some lines}
The Covenant ship slowly turned toward thePillar of Autumn and its turret tracked their position. For the
first time in his life, Keyes prayed that a Covenant ship’s shields would hold.
The alien ship became a flash of white light; its outline blurred. Their shields held for a split second as
the Shiva warhead detonatedinside its protective aura. The shockwave rebounded off the asymmetrical
shape of the shields just before their collapse. Jets of energy exploded outward at three different angles.
Thunder and plasma roiled into space . . . cleanly missing thePillar of Autumn .
The shields go down a second time, indicating that they had recharged.
They then begin recharging a third time with the crashed Longswords on the hull.