  We numerically examine dynamical irreversible to reversible transitions and
random organization for periodically driven gliding dislocation assemblies
using the stroboscopic protocol developed to identify random organization in
periodically driven dilute colloidal suspensions. We find that the gliding
dislocations exhibit features associated with random organization and evolve
into a dynamically reversible state after a transient time extending over a
number of cycles. At a critical shearing amplitude, the transient time
diverges. When the dislocations enter the reversible state they organize into
patterns with fragmented domain wall type features.
