The Pentagon must be on milk break.

How are you?

The Korean War lasted from 1950 to 1953.
Numerous Korean soldiers and civilians were killed,
and quite a lot of American soldiers lost their lives too during the war,
for which I'm so sorry and grateful. Thank you.

Anyway,
After North Korean forces overran most of South Korea,
General Douglas MacArthur came up with a secret plan to attack
behind enemy lines.
Against all odds, he made it, and thanks to the successful operation,
the America-led coalition could regain most of the territory once taken by the North.

Well, I just watched a movie about that historical event,'OperationChromite',
in which Liam Neeson starred as MacArthur.

Now, it's time to study English.
Here is part I don't follow the meaning of.

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< UN Command HQ, Tokyo, August 23, 1950, final strategy meeting >

General Douglas MacArthur is waiting for some people outside a building.
Soon, three soldiers get off a car, and MacArthur gives them warm greetings.

With a big smile, MacArthur says to them,

"Well, well, well...
The Pentagon must be on milk break, dispensing The Three Stooges
to silence the old mad dog."

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Well, the Korean subtitle says,

"Well, the Pentagon now can have a sigh of relief
as they have sent the best three soldiers to deal with Kim Il-sung."

'The old mad dog' obviously refers to Kim Il-sung, the leader of North Korea then, no doubt about it.

But 'be on milk break' is rather confusing.

'Break' is like, you know, rest, as in 'Take a break'.
Then, 'milk break' probably means 'the time allowed for babies to have milk,' I guess?

Is it, like the subtitle says, the Pentagon can relax thinking the situation is under control?

Someone or something is on milk break.
What is that supposed to mean?

I'd appreciate any comment.
Thank you.