This is the third mission, and contains total six collectible pilot helmets and highlighted in the timestamps below.
00:30 – Make your way to Major Anderson’s rendezvous point
03:00 – New Titan Loadout
03:43 – Pilot Helmet 1 (Collectible)
05:42 – Disembark BT and get to the control room to open the flow regulation gate
05:54 – Pilot Helmet 2 (Collectible)
09:55 – Find a way to rejoin BT
12:46 – Pilot Helmet 3 (Collectible)
16:57 – Pilot Helmet 4 (Collectible)
21:05 – Pilot Helmet 5 & 6 (Collectible)
23:55 – Shut down the toxic sludge flow to rejoin BT
25:37 – Survive until the sludge pump shutdown is complete (Survive the waves of ticks, soldiers & robots)
29:27– Boss Fight (Kane)
31:20 – Remove Kane’s helmet radio from his corpse