the last serial of Division Headquaters Battalion

[GoodTaste]

The Battalion CP had reason to believe that the oputposts on East Hill would be relieved shortly by George Company, with the 41st Commando in perimeter reserve. Both had departed Koto-ri that morning in a strong convoy which also included an Army infantry company, four platoons of Marine tanks, and the last serial of Division Headquaters Battalion.

Source: The Chosin Reservoir Campaign

What does "serial" mean? It appears to have a particular meaning in military context. Does "the last serial" mean "the last part" here?

 

[Skrej]

Yes, it has a special definition as used by the US Department of Defense. See definition #2. It means the last group from the Division Headquarters Battalion.