I'm not really sure why they got removed, but they did have them. The switch is is still on the panel. Someone told me "why" at some point, but it was a long time ago and can't vouch for the accuracy. I think it boiled down to they just didn't work "right." Not sure if that means they worked when you didn't want them to or they didn't work well enough to hold the bird up. Maybe a combination.
The 60B, F & H were all build with floatation bags located at the top of the forward strut for the main landing gear. It was orginally designed to use helium which would increase the bouyancy but when the Navy got a hold of it, they used nitrogen.
The bags when inflated covered the bottom 1/3 of both pilots windows (primary egress point) if the aircraft was floating upright.
If the aircraft is inverted in the water (as the naturally do, since helos are top heavy) then it wasn't as big of a concern.
The standard ditch brief was to jettison the door windows in the flare (or just prior to impact) BEFORE blowing the bags.
There was lots of maintenance required on the system and most pilots stated they would never blow the bags since the H-60 (assuming fuselage is still in one piece, which is the historical norm) will float near the surface due to air in the fuel tanks.
So, since the pilots were reluctant to use the system, there was a financial cost to keeping the system operational combined with the fact that it really wasn't needed, NAVAIR pulled the system out.
The airframe was tested in the water with the float bags and that airframe is still visable on a stick at the enterance of Naval Station Mayport.
(All this was told to me by the test pilot who did the float system test back in the early 80's)