What events caused the National Security Council to suggest the U.S. triple its current defense budget?

What time period are you talking about?

This might give you some ideas
http://209.85.165.104/search?q=cache:Z0jf6XqFj6AJ:intelligence.senate.gov/108161.pdf+National+Security+Council+to+suggest+the+U.S.+triple+current+defense+budget%3F&hl=en&ct=clnk&cd=5&gl=us&ie=UTF-8