Army FW
The Army operates five different kinds of fixed wing aircraft (at least in their operational fleet...test fleet notwithstanding). They operate various models of the C-12 (C-12D, C-12F, C-12R), the UC-35 (Citation Bravo), the C-20, the C-23 Sherpa (Shorts 330), and the C-26 (Fairchild Metro).
The C-12s mostly have the standard all-white paint scheme, with a black cheater line, and gray "United States of America" painted on the cabin.
The UC-35s generally have a white paint scheme with gold and black (Army colors) cheater lines. Most of the C-26s have the same paint job.
The C-20s are either all white (like the C-12s) or have the USAF-style white/blue/gold paint scheme.
The C-23s have a low-vis grey paint scheme like the USAF heavy fleet.
The C-12 fleet is distributed to both the active Army and the National Guard. The C-20s are all active-duty, and most of the C-26s and C-23s are National Guard. As far as I know, the C-35s are mostly active, although I do hear the Guard is operating a few of them.
For the future, the Army will get rid of all the C-12Ds (if they aren't already retired) and the C-12F. The Guard will operate the bulk of the C-12R fleet, and the UC-35 will replace most of the older C-12 airframes. For FYI, the C-12D has the old "steam gauges" and a 3-blade prop. The C-12F has better engines and introduced the four-blade prop, and the C-12R has a glass cockpit and other improvements. The C-26 and C-23 will both be retired and replaced with a new airframe...among those considered is the C-27J Spartan.
One other thing that others have asked and I'll go ahead and get it out of the way....if you want to fly FW for the Army, better plan on spending several years in helicopters before you can consider that move.