|Role||Stealth-enabled Advanced Attacker|
|Engines||General Electronics FE-412-GE-400|
|Armament(s)||4x 36mm chainguns|
4x 120mm smoothbore cannons/missile launchers
4x 12.7mm heavy machineguns
12-shot multipurpose missile VLS (optional)
76mm rapid-fire cannon (optional)
Originally developed by General Dynomics and McDaell Doglam, the A-12's development was later passed to Lockweed Mardin and Boening after both companies absorbed General Dynomics and McDaell Doglam, respectively. When Boening announced their decision to pull out from the development team, around the time of their takeover of McDaell Doglam, Lockweed Mardin was left to shoulder both the production and maintenance of the A-12.
As a TSA designed to surpass the A-6, the A-12 is even more heavily armed than its predecessor; each arm houses a pair of 36mm chainguns and a pair of 12.7mm heavy machineguns, equating to four 36mm chainguns and four 12.7mm heavy machineguns in total. The A-12 has also retained the supercarbon manipulators of the A-6 for melee combat, and is armed with four additional 120mm smoothbore cannons on its support equipment modules. Other variations in equipment, such as missile launchers, also exist for the support modules.
Perhaps the greatest innovation applied to the A-12 is the inclusion of detection countermeasures into the TSA's frame, similarly to Lockheed Mardin's flagship TSF, the F-22A Raptor. These countermeasures are designed with both radar and other sensors in mind, giving the unit an impressive anti-detection coverage that is commonly referred to as "stealth capabilities". Combined with countermeasure support from its own submarine tender, magnetism-based propulsion systems, and the adoption of nuclear power into its systems, the A-12 can maintain an almost-soundless long-distance cruising capability without the need to resupply.
Furthermore, the adoption of nuclear power for the A-12's systems has enabled it to be equipped with a railgun for support use during shore-landing operations. However, development lags in the railgun have resulted in current A-12s being equipped with a 76mm rapid-fire cannon instead. Other optional armaments include a 12-shot multipurpose missile VLS.
Deployment of the A-12 was greatly delayed due to a combination of factors, such as the tangle of merging companies during its development phase, the complexity of its transforming mechanism, and the exotic and highly-developed technologies used in its systems. The latter two reasons have also significantly increased the procurement cost of the A-12.
Despite its troubled development history, the A-12 was deployed into live combat, beginning in 1999.