For me, DOD qualifications will be someone, most likely 4 star general material, that have had extensive experience command US troops in battle. As with Austin, someone that has experience commanding an entire region of command.
I was an active duty US Army officer for 28 years. Your suggestion of a SECDEF with extensive combat experience may sound like the appropriate credentials, but that experience does not bring the right set of skills to the table.
There is a vast transition going in military munitions. Lloyd Austin predicted that Russian tanks would overrun Kiev in two days, but Javelin missiles that were carried and fired by single soldiers took out virtually every tank with ease (link). Tanks are now essentially obsolete. Ditto armoured personnel carriers.
The same is true of aircraft carriers. They are obsolete. China, Russia and Iran all have "carrier killer" hypersonic missiles that can destroy them. They fly at Mach 5 (a bullet from a rifle flies at Mach 3) and while our carriers have anti-missile missiles that can intercept them, when fired in swarms at a carrier several are certain to get through. FYI, DOD opened a hypersonic missile lab at Purdue last year (link).
Fighter jets are also obsolete. Modern surface-to-air and air-to-air missiles can easily take them out.
We need a SECDEF who understands that the future of warfare will be drones, fire-and-forget missiles, a sub-surface Navy, AI-piloted aircraft, the much-ridiculed Reagan Star Wars and ground troops who are not massed together in clusters.
Colin Meyer
Colonel, US Army (ret.)
Russia is thought to have lost more than 400 tanks in Ukraine during the current conflict.
www.bbc.com
Amidst the hype about hypersonics, behind the hysteria and sensational headlines, is a new type of weapon which could help reshape the naval arena. Anti-Ship Ballistic Missiles (ASBMs) pose an unpredictable threat to aircraft carriers and other high-value targets.
www.navalnews.com
engineering.purdue.edu