  We identify putatively maximally dense packings of tangent-sphere trimers
with fixed bond angles ($\theta = \theta_0$) using a novel method, and contrast
them to the disordered jammed states they form under quasistatic and dynamic
athermal compression. Incommensurability of $\theta_0$ with 3D close-packing
does not by itself inhibit formation of dense 3D crystals; all $\theta_0$ allow
formation of crystals with $\phi_{max}(\theta_0) > 0.97\phi_{cp}$. Trimers are
always able to arrange into periodic structures composed of close-packed
bilayers or trilayers of triangular-lattice planes, separated by ``gap layers''
that accomodate the incommensurability. All systems have $\phi_J$ significantly
below the monomeric value, indicating that trimers' quenched bond-length and
bond-angle constraints always act to promote jamming. $\phi_J$ varies strongly
with $\theta_0$; straight ($\theta_0 = 0$) trimers minimize $\phi_J$ while
closed ($\theta_0 = 120^\circ$) trimers maximize it. Marginally jammed states
of trimers with lower $\phi_J(\theta_0)$ exhibit quantifiably greater disorder,
and the lower $\phi_J$ for small $\theta_0$ is apparently caused by trimers'
decreasing effective configurational freedom as they approach linearity.
