How to Prove Boots on Ground or Ship Docked to Pier

[alliem]

Hi, my dad was in the navy on USS Ranger from 1969-1975, and he is positive that Ranger docked to pier in Vietnam on numerous occasions, and that he went off ship on work details, so he did have boots on ground. However, the USS Ranger is not on the VA's presumptive ship list. I am brand new to all things VA. I only have his DD-214, which says nothing useful.  Is there any way I can gather evidence that either a) he had boots on ground, or b) Ranger docked to pier in Vietnam?

One person at VA suggested reviewing the ship logs in the national archives, but that mostly only lists coordinates and has very little detail. Alternatively, an environmental health coordinator at the VA said when we go in for the AO Registry Exam, they'll ask him about having boots on ground and decide on the spot whether he qualifies -- that didn't seem like a great prospect, given that Ranger is not on the ship list.  Any input from anyone who has been in a similar situation would be helpful. Thank you! 

[Berta]

There is an update to the Danang Harbor situation:

https://www.hillandponton.com/da-nang-harbor-case/

Matt Hill, vet attorney, is a hadit member-