

D- day is a great example of why opsec matters so much. The Germans knew that the allies were going to invade, and if they had been prepared they very well might have rebuffed the invasion. But the secrecy worked, and operation overlord succeeded instead of being a bloody failure.
If the target of the military raid had known when it was coming, they could have simply relocated anything actually important away from the target zone.
A useful analogy is probably a boxer and a ring: your opponent knows that you’re going to throw a punch, but you really don’t want him to know exactly what punch you’re going to throw when.
Not even.
2+2=(3,4,5) is just recognizing imprecision in the original measurement.
The “budget” not matching appropriations is “I’m only going to spend 100 on lotto tickets this month, and save 50” and then buying 150 in lotto and putting the 10 you ‘won’ in savings.
It’s not the math ending up. It’s just recognizing that budgets are nonsense if the actual spending is a wholly separate act of Congress.