In the government, and large organizations as well, there is often a large pot of money that is 'use it or lose it'. In fact, overspending can often justify need for larger budgets next year around and underspending can make you look bad as someone who doesn't know how to forecast their requirements better. It is diametrically opposite to how thoughtful people budget for themselves or their homes and leads to things that make no sense at a logical level 'save resources, etc' but makes perfect sense at another level, 'grow my empire'.