Oshkosh’s latest tactical vehicle stalls

The latest version of Oshkosh Corp.’s medium tactical military vehicle has been marred by “poor reliability and degraded functionality” that forced a halt in development testing, according to the Pentagon’s top weapons evaluator.

Variants of the new A2 model of the Army’s Family of Medium Tactical Vehicles “experienced several failure modes” in early testing with everything from stuck doors to problems with its suspension, sway bar, coolant and engine leaks, sensor failures and driver display unit, Robert Behler said in his new annual test report.

The model may “necessitate a redesign” to meet its requirements, Behler wrote. Testing of the vehicle was suspended in May.

Oshkosh extended its decline on news of the testing report, falling as much as 3.5 percent. The shares’ 3.9 percent gain in the 12 months ended Thursday lagged behind advances in broad U.S. indexes.