That is far too small for a diplomatic code in 1819 much less 1919.
That is diplomatic code for "go ahead and do the dirty work."
They had been working on Japanese diplomatic codes.
There is nothing in the diplomatic code that obliges me to stand for something I don't like to hear.
If we can break diplomatic codes I see no reason why we couldn't view a standard cube.
And more significantly, the Japanese diplomatic code had been broken by American intelligence.
Other items included diplomatic codes, nuclear-weapons doctrine and civil defense preparations.
Both forwards, in diplomatic code, usually stress how much they prefer working together.
American intelligence could read the Japanese diplomatic (but not naval) codes and knew that war was a very strong possibility.
Pullella is just reminding us what 'policies that undermine the family' means in diplomatic code.