Cut every government agencies budget 10% except for the VA, DoD and Law Enforcement. This will force leaders to tighten the belt. This would save Billions a year
Then at the end of the fiscal year instead of spend it or lose it the left over money can be added to the next year budget. The end of the fiscal year causes agencies to waste money. This can also help with saving money for long term projects.
There could be an office supply reutilize center. This would work on military installations very well and even big government buildings. Leaders are forced to clean out their supply closets and turn in access to a reutilize point in which units without a lot of budget money could get office supplies cheap and or free.