A Vietnam war veteran returns home after two years only to discover that his family is missing, his childhood house is gone, and his closest friends no longer recognize him.

The premise sounds very similar to an Industry Insider Screenwriting contest from earlier this year:
"
A soldier returns from an 18-month deployment and finds that the family home is missing - even the address no longer exists."

http://www.writersstore.com/industry-insider-screenwriting-contest-randall-wallace/

You've got the premise above but you don't tell what the rest of his journey is. You're missing the elements:

Antag
Goal
Stakes
Hook

Plus your genre isn't clear. Is this a drama, thriller, scifi, horror? Stick in the above elements and you'll have a clearer logline that conveys the story to your readers.

The "after two years" part seems unnecessary. Otherwise it sounds really good!