This is the actuall chords from the Country Joe website, they didnt have anything on
this site so i decided to just copy and paste it...here it is:

1:
 D
Come on all of you big strong men,
 G
Uncle Sam needs your help again.
      D
He's got himself in a terrible jam
 G
Way down yonder in Vietnam
   E7                       A
So put down your books and pick up a gun,
       D                        G
We're gonna have a whole lotta fun.
 
Chorus:
         A7   Bb7    D
And it's one, two, three,
 D7           G
What are we fighting for?
                  D
Don't ask me, I don't give a damn,
              G
Next stop is Vietnam;
          A7   Bb7   D
And it's five, six, seven,
 D7           G
Open up the pearly gates,
             E               A
Well there ain't no time to wonder why,
     D                    G
Whoopee! we're all gonna die. 

 
2:
 D
Come on generals, let's move fast;
 G
Your big chance has come at last.
 D
Gotta go out and get those reds —
     G
The only good commie is the one that's dead
     E7                          A
You know that peace can only be won
             D                       G
When we've blown 'em all to kingdom come. 

[Chorus] 
 
3:
 D
Come on Wall Street, don't move slow,
     G
Why man, this is war au-go-go.
          D
There's plenty good money to be made
     G
Supplying the Army with the tools of the trade,
 E7                              A
Just hope and pray that if they drop the bomb,
      D                   G
They drop it on the Viet Cong. 

[Chorus] 
 
4:
 D
Come on mothers throughout the land,
 G
Pack your boys off to Vietnam.
 D
Come on fathers, don't hesitate,
 G
Send your sons off before it's too late.
        E7               A
You can be the first one on your block
              D                  G
To have your boy come home in a box. 

[Chorus]