I'm a long term fool reader and first time board writer. I recently tried my hand for the first time with the foolish four. I feel good about it. Now my concern lies with my spouse's Thrift Savings Plan. (He's a federal Criminal Investigator) Right now my spouse contributes 5% and will max it out later this year. He has the option to choose among three investment funds. 1. Government Securities Investment Fund-this is invested in short term risk free US Treasury securities. 2. Common Stock Index Investment Fund-invested in a stock index fund that tracks the S&P's 500 stock index. and 3. Fixed Income INdex Investment Fund-this is invested in a bond index fund that tracks the Lehman Brothers Aggregate bond index. Right now my spouse has divided his contribution up as 20%, 60% and 20% respectively. I want the most bang for the buck. Wouldn't it be best to put 100% in the Common Stock Index Investment Fund? We have until the end of the month to make a decision so any suggestions would be greatly appreciated.