How do you even begin sizing the drone defense market?

Start with defense budget allocations — the US DoD alone has requested over $500M in counter-UAS funding recently, and allied nations are scaling fast too. Layer in commercial verticals like airports, stadiums, and critical infrastructure to build out the non-defense slice. Frost & Sullivan and Verified Market Research have decent recent reports, but honestly cross-referencing government contract databases like USASpending.gov gives you way more reliable ground truth.