What is the M88A2 Hercules, the heavy US Army vehicle that sank in a deadly training incident in Lithuania?

What is the M88A2 Hercules, the heavy US Army vehicle that sank in a deadly training incident in Lithuania?

The M88A2 Hercules was recovered from a swamp during a recovery operation for four US Army soldiers who went missing during a training exercise.

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Lauren Frias

An M88 recovery vehicle tows an M1A2 Abrams battle tank at a container terminal in Gdynia, Poland.MATEUSZ SLODKOWSKI/AFP via Getty Images