In addition to the white (1 units) and red (5 unit) chips, a few other ways to help out with massed land forces in your games…
In the past, I have used the territory markers to deonte 10 units for INF and ARM stacks. In a REALLY big stack when chips are short, use a die and the number on top indicates the multiples of 10 for that stack (thus 1 die and 1 INF figure can represent 11, 21, 31, 41, 51, or 61 units) Add in red and white chips and you can now get any number of units up to 70+ units represetned with a very small number of chips.
EX: A die reading 4 is placed on top of 1 red chip, 2 white chips, and is capped wtih an infantry figure. The total number of infantry divisions in that stack is 48.
Piece borrowing form other nations is also a great way to help out with being short units. For example, I often use Germany’s transports for my Japan navy. Pretty easy to keep track of those grey ships in the Pacific and know that they are not German :-) Just be careful to send the actual Japan trannies toward Africa since as they approach Europe they COULD then be confused with actual German pieces.
And last but not least… a second game is also a great source of units. In my case, it is a new copy of Avalon Hill A&A and my old Milton Bradley 2nd Edition A&A. Extra chips, extra units… the only pieces that I do not have duplicates of are destroyers and artillery, since those did not exist in Classic. But I certainly have more than enough Russian Battleships! LOL