[m_dupont]

I'm also loving their phrase "on a nonlinear battlefield"

... not sure what a linear battlefield would be

[wilkommen]

I think a linear battlefield is one in which there is a "front line", which was a given for prior wars but maybe not as much anymore. Future wars might see adversarial forces mixed among each other spatially more than in the past.

[eszed]

Static (relatively, at least) battle lines? Think of WWI: you knew where the danger was, and where it wasn't.

Not that I know anything in particular about this piece of military jargon, but that's my contextually-informed supposition.