Need Some Help IDing a Knife

[Bugout Bill]

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Anyone know what this is? The owner stated that it is stamped Ontario and US on the blade, but doesn't know the exact make and model of the knife.

Thanks.

 

[TSilant]

Now, i might be wrong, but i feel like if i dont point at one possibility itd be unfortunate if i turned out to be right.

US Ontario Marine Combat Knife.
Heres some images:
http://s17.postimg.org/orufbj4dr/DSCN0378.jpg
http://s13.postimg.org/jf5kxf3lj/DSCN0382.jpg
The only reason i wont say for sure is because the sawback doesnt seem to be very common. Everything else looks like a match though?

 

[Bugout Bill]

Now, i might be wrong, but i feel like if i dont point at one possibility itd be unfortunate if i turned out to be right.

US Ontario Marine Combat Knife.
Heres some images:
http://s17.postimg.org/orufbj4dr/DSCN0378.jpg
http://s13.postimg.org/jf5kxf3lj/DSCN0382.jpg
The only reason i wont say for sure is because the sawback doesnt seem to be very common. Everything else looks like a match though?

Thanks. That's what it seems like it is.

 

[tltt]

Yeah, it's a factory modification that was available from Ontario. I'm not sure when they were first offered, but they were a catalog item in the 90's.