Stuck on 1st level ?
 

I am stuck in the church trying to pick up the fuel can for the boat but i cant figure out how to pick it up ? when i put the mouse over the feul can i get the hand icon but when i click on it nothing happens ? has anyone else had this problem

Check out the video walkthrough: http://www.menofwargame.com/games/vietnam/videos/19

But most likely you don't have enough space in the inventory for fuel can.

I had the same problem. You need to clear out some items in your guy's inventory, then pick up the fuel can. You can clear out inventory items by clicking on a dead guy and transferring items from your inventory to his, then go get the can. Fuel cans and document bags take up 4 - 6 spaces in your inventory, so be sure to clear sufficient items from your inventory to pick up the can.