Yeah there are two "missable" dogtags in the Tanker level. The one is in the bomb area just before the Olga boss battle. After you defeat Olga, the sole soldier patrolling the "bomb" area should be moved to the upper part.
Take him out, hide him and another solider should come up the stairs.
Another one is at the second bomb area where a soldier enters and radioed in. Hold him up AFTER he finish his radio conversation.
There may be more that I don't know.
Also I forget where the strawberry float the Socom suppressor is in the Tanker level. Help!
You have to climb up that big ladder, right at the top of the ship (I can't remember what the top of a ship is called, whatever the 'roof' is
) , you can get it there just after fighting Olga. Although I have a feeling it might only be there on certain lower difficulty levels, not sure.
I went up the ladder I think you're talking about on Normal and got the T. Goggles there.
It's not there. (And I was playing it on Very Easy. Sod playing Normal then go back playing it on Very Easy and get all the dog tags.)
Woah are you sure? The thermal goggles should be right at the top, and the suppressor on the first or second landing from that ladder. I'm sure it's there on easy/very easy... This is bothering me, I have the guide at home, I'll check tonight!
edit: I think, the suppressor isn't there in MGS2: Sons of Liberty, they added it in Substance. I think. So it has to be there, I've been using it!
last edit: realised my guide is, of course, for Sons of Liberty, so no explanation on a socom suppressor.
Well, I have started playing it on Normal. Just finished the bomb disposal. I will load up the game and see if the supressor is there when I've finished this playthrough.