Strength figures: categories

[Nick Beale]

The unit strength returns on (for example) Bundesarchiv RL 2-III/735 give three columns of figures for crews under the headings:

Ist / eins. / verfb.

Ist is easy enough: actual strength

eins. I take as either einsatklar of einsatzfähig: ready to operate or able to operate

verfb. presumably verfügbar: available (e.g. on base?)

Then comes a final column: Kampfeins. It's written with a capital letter, suggesting a noun rather than an adjective, so presumably something like Kampfeinsatz (combat operation) but if so, what is it counting? Sorties flown that day or something else?