Some Vietnam helicopter pilots wore the hand guns swung around to between their legs in the thought that would offer some protection. Some placed the old style soft Flak Jackets in the chin bubble thinking the same.
On our Chinooks we added half inch Steel plate to the Jettisonable doors on each side of the cockpit. We salvaged armored pilot seats for our gunners use and added a steel plate at the rear of the cargo hatch for our Flight Engineer to lay on while monitoring the under-slung load.