I have it technically working now, although I had to add a package and
some new commands (I've commented where that part is).
I'm also getting my figure captions to be double spaced (and it looks
like my main text is only 1.5 spaced, but I could be wrong -- if you
see what's going wrong there, please let me know).
\documentclass[12pt,final]{ucsd}
\usepackage{deluxetable}
\usepackage{longtable}
\usepackage[utf8]{inputenc}
\usepackage{gensymb}
\usepackage{nag}
\usepackage[colorlinks,linkcolor=black,citecolor=black,urlcolor=black]
{hyperref} % OGS printing requirements.
\usepackage{enumitem} % allows for item marks as a parameter
\usepackage{url}
\usepackage{color}
\usepackage{microtype}
\usepackage{fancyvrb}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{latexsym}
\usepackage{lscape}
\usepackage{chapterbib}
\usepackage{tocbibind}
\usepackage{natbib}
\def\newblock{\hskip .11em plus .33em minus .07em}
%% Added since question asked
\usepackage{tocloft}
\renewcommand{\cftchapfont}{Chapter }
\renewcommand{\cftfigfont}{Figure }
\renewcommand{\cfttabfont}{Table }
%%
\usepackage{boxedminipage}
\usepackage{listings}
\usepackage{ifthen}
\usepackage{ifpdf}
\usepackage{graphicx}
\graphicspath{{img/}}
\input{../inc/commands}
\begin{document}
%% Code for figure:
\begin{figure}
\begin{center}
\showpicture{\includegraphics[width=0.8\textwidth]{vpfit/
plot00}}
\caption[VPFIT]{
The fit (green) and residuals (red) for {\vpfit}.
Line: CrII 2056.
}\label{fig:vpfit0}
\end{center}
\end{figure}
Thanks for any suggestions for improvements!
Jonathan