How do I format my section/subsection titles without changing the cross-referencing result

Question

I am using some code recommended by the editor of a journal. However, the \renewcommand line for \thesubsection and \thesubsubsection seems to be causing a problem with the cross-referencing function \ref.

When I reference a subsection (e.g., 'II.A') it only displays "A" or a subsubsection (e.g., 'II.A.1') I just get "1".

Is there a way to fix this code so that it properly references the subsections with the section number included.

\documentclass[12pt, titlepage, reqno]{article}

%load packages
\usepackage[margin=1in]{geometry} %overwrites 1.5" default margins   from    article class
\usepackage{graphicx}% Include figure files
\usepackage{dcolumn}% Align table columns on decimal point
\usepackage{amssymb,amsmath,amsfonts}% popular packages from the American Mathematical Society
\usepackage{bm}% Bold Math package
\usepackage{array}
\usepackage{color} %colored text
\usepackage{float}
\usepackage{setspace}
\usepackage[super,comma,sort,compress]{natbib}
\usepackage{latexsym}
\usepackage[mathscr]{eucal}
\usepackage{enumerate}
\usepackage{titlesec} %for formatting section titles
%\usepackage{appendix}


%% SECTION TITLE FORMATTING
\renewcommand{\thesection}{\Roman{section}} %numbering
\titleformat{\section}
  {\normalfont \bfseries \raggedright \uppercase}
  {\thesection.} %numbering
  {0.5em}{}

\renewcommand{\thesubsection}{\Alph{subsection}} %numbering
\titleformat{\subsection}
  {\normalfont \bfseries \raggedright}
  {\thesubsection.} %numbering
  {1em}{}

\renewcommand{\thesubsubsection}{\arabic{subsubsection}} %numbering
\titleformat{\subsubsection}
  {\normalfont \bfseries \itshape \raggedright}
  {\thesubsubsection.} %numbering
  {1em}{}