Dredge Walkthrough Part 3

Part 4 of this series (almost over thank goodness)

1:33 talk to the airman to progress story and unlock his side mission with dog tags
2:49 1st mortar piece
4:49 1st dog tag location
5:23 2nd dog tag location
5:43 last dog tag location
6:23 final mortar piece
7:34 shrine location (requires any mutant fish)