Government Funding

Why doesn’t the United States have all government agencies that oversee our national security (the military and Homeland Security), and other vital services from the government, be continually funded at last year’s level, until a new budget is approved? 

It is unbelievable that we allow government agencies (including the military) to go unfunded because Congress can’t agree on a budget.

At the very least, if the government is shutdown, fully or partially, Congress should not be funded either. Additionally, the military and Homeland Security should never go unfunded.