The installment-plan defense

Military procurement was built for capital threats: a bomber, a carrier, a satellite — designed once, used for decades, replaced on a generational cycle. The arrival of cheap, software-defined drones has broken that contract. The threat can be re-fielded in days by a unit that does not wait on an appropriations cycle, while the answer arrives on a multi-year procurement cycle.

The Congressional Budget Office, per Stars and Stripes' reporting, puts a number on the gap. The scenario covers 100 installations defended with a multilayered kit of radar, RF jammers, and kinetic interceptors. The estimate: up to $7.4 billion to buy and install, roughly $500 million a year to maintain, and a fresh purchase every four to five years as the threat evolves. Not a one-time procurement line — a recurring defense subscription, billed in presidential terms.

The scope gap is the second-order fact. CBO's 100 sites come out of 824 installations in the Bureau of Transportation Statistics database — roughly 12% of the fixed footprint. The other 700-plus sites face the same threat and a thinner answer, or no answer. The attacker only has to find the unprotected base.

A low-end drone and a high-end counter-UAS suite share a single constraint: the attacker buys in commodity time, the defender buys in appropriations time. The math compounds the same way at the Navy's Bahrain hub, at forward bases in the Gulf, and at any fixed site an adversary can reach — a bounded inference from the general CBO procurement-mechanism asymmetry, not a site-specific empirical finding.

Call it the installment-plan defense. The check is dated; the threat is not.