Senator Johnston does not understand that using percent of gross-domestic–product (GDP) as a gauge of Defence spending means nothing.
Given the ill-health of the budget and debt, the only thing that matters is how many billions are available for Defence each year after all the other bills are paid (no borrowed money).
Defence comes last because Australia is an entitlement society. And in such a society, if it is the entitlement that is sacred, Defence is not entitled to a fixed annual fief.
Further, if things keep going the way they are, that is, a government produced, business-unfriendly environment and spendthrift federal budget strategy, Defence will soon be lucky enough to get table scraps.
Johnston loses even more credibility by referring to the moronic Defence White Paper of 2009 as if it has worth.