  Four ultra-luminous infrared galaxies (ULIRGs) observed with JWST/NIRcam in
the Cosmos Evolution Early Release Science program offer an unbiased preview of
the $z\approx2$ ULIRG population. The objects were originally selected at 24
$\mu$m and have strong polycyclic aromatic hydrocarbon emission features
observed with Spitzer/IRS. The four objects have similar stellar masses of
${\sim}10^{11}$ M$_\odot$ but otherwise are quite diverse. One is an isolated
disk galaxy, but it has an active nucleus as shown by X-ray observations and by
a bright point-source nucleus. Two others are merging pairs with mass ratios of
6-7:1. One has active nuclei in both components, while the other has only one
active nucleus: the one in the less-massive neighbor, not the ULIRG. The fourth
object is clumpy and irregular and is probably a merger, but there is no sign
of an active nucleus. The intrinsic spectral energy distributions for the four
AGNs in these systems are typical of type-2 QSOs. This study is consistent with
the idea that even if internal processes can produce large luminosities at
$z\sim2$, galaxy merging may still be necessary for the most luminous objects.
The diversity of these four initial examples suggests that large samples will
be needed to understand the $z\approx2$ ULIRG population.
