 K-theory classifies D-branes in noncompact spacetimes, intuitively in spacetimes in which we are not concerned about the flux sourced by the brane having nowhere to go.While the K-theory of a 10d spacetime classifies D-branes as subsets of that spacetime, if the spacetime is the product of time and a fixed 9-manifold then K-theory also classifies the conserved D-brane charges on each 9-dimensional spatial slice.While we were required to forget about RR potentials to obtain the K-theory classification of RR field strengths, we are required to forget about RR field strengths to obtain the K-theory classification of D-branes.