But why do you only have 100 million (don't have a pound sign on my Antipodean keyboard, sorry) for Defence, when you have 1.5 billion to spend on immigration?
It isn't because the nation/government/state doesn't have the money; it's because politicians choose to spend it in other areas. This is where your answer lies.
We have exactly the same situation here. Government axes an Air Combat Force which cost $80 million a year to run (on the grounds of unjustifiable expense), but happily spends 1.1 billion on Social Welfare - every month.
Get political, people. It is the bean counters and the bent politicians who need preaching at. Here, we are already converted.
Good luck, and any useful feedback from your end gratefully received in our own campaign
Top thread, WEBF
