That suggests it will have an un-refueled combat radius of around 5,000 kilometers. As shown in the figure below, that would allow it to operate from deep within Australia (I’ve used Alice Springs to illustrate the point) and still cover the entire archipelago to our northwest, the South China Sea, our South Pacific neighbours, and the gap between Guam and Papua New Guinea.

Because of its inherent range, the B-21 wouldn’t require air-to-air refueling. Being based well inland, it wouldn’t be exposed to the same extent to the threats that our northern bases or offshore airbases are faced with. A strike platform like the B-21 would still require sophisticated enablers to find and precisely target an adversary in that huge combat radius. Those come at a substantial cost.

The B-21 could deliver a broad range of effects. A strike package of four aircraft could likely carry around 40–50 long-range maritime strike weapons, which would inflict unacceptable losses on any maritime or amphibious task force. If the target was the adversary’s forward operating bases, a first wave of aircraft could use long-range stand-off weapons to destroy their air defenses (including aircraft on the ground), with each bomber in a follow-up wave delivering around 80 precision-guided  JDAM (Joint Direct Attack Munition) bombs, or around 200 small-diameter bombs.

Moreover, the bombers could return the next day, unlike a submarine which could need a month to return to the fight after going home to reload once it had launched its handful of strike missiles. No other system could deliver a comparable weight of fire. It would certainly get the attention and shape the military planning of any power that wanted to operate in that huge circle.

The B-21 could also be used tactically to deliver close air support to Australian and allied troops on the ground, as US bombers have done in the Middle East. A single B-21 could carry about as much ordnance as a squadron of F-35s but with greater range and persistence over the target and fewer enablers.

But it wouldn’t be able do everything. A B-21 won’t perform anti-submarine warfare in the same way as the ADF currently does it with a combination of ships, submarines and aircraft. But it could do it in a different way—for example, by striking enemy submarines in port or by air-dropping smart sea mines off those havens or in key choke points.

Based on public information, it’s possible that Australia could get aircraft into service in the second half of the 2020s. So it couldn’t happen overnight, but it’s certainly faster than even the most optimistic future submarine schedule.

Of course, that great capability comes at a great cost. The USAF is aiming at a unit cost of US$564 million in 2016 dollars. That’s if it can get the 100 aircraft it wants and escape the death spiral of other programs like the B-2 and F-22, which cut production numbers to reduce program costs. That drove up unit costs, which in turn forced cuts to projected unit numbers. So we would probably be looking at a cost of around A$1 billion per aircraft.

It’s hard to know how many we’d need for a viable capability. The RAAF acquired 24 F-111Cs, followed by 15 F-111Gs, but at retirement there were only 13 left in service. The USAF is operating a fleet of 20 B-2s. Let’s assume the sweet spot is around 12 to 20 aircraft. Since total program costs are usually around 1.5 to 2 times the cost of the aircraft themselves, we’d be looking at around $20–40 billion. That’s a lot of money, but less than the cost of the future submarine program.

The real challenge is always affording the annual cash flow without gutting the defense budget. Unlike the future submarine program, which is drawn out over nearly 40 years, the bulk of the spending to acquire the B-21 would likely be compressed into five or six years, requiring around $5–6 billion per year. That’s over half of Defense’s capital equipment budget. And it’s more than the entire local shipbuilding program when it is up and running (which has been declared untouchable).

It’s hard to see Defense being able to afford that without a massive cash injection from the government. But if the government is serious about addressing our worsening strategic environment, the B-21 would be an investment that made both friends and potential adversaries sit up and take notice.

This article by Marcus Hellyer first appeared at the Australian Strategic Policy Institute. 

The article is being republished due to reader interest.