Gentlemen, in making your suggestions, please keep in mind three basic game design concepts:
1. There is a necessary trade-off, or balancing, between realistic detail and abstraction/simplification required to maintain the "playability" of any war game.
2. The level of detail, or "granularity," of COW is based on regimental size military formations, i.e., regiments (~1,000 to ~1,500 men, plus small arms), brigades (~600 men, plus ~80 to ~120 armored vehicles), and squadrons (~400 men, plus ~12 to ~24 aircraft). Even submarine and destroyer naval units do not represent single vessels, but naval unit "squadrons" composed of at least four boats or ships and their crews.
3. The weapons technology of the game is based on the common technology of World War II, i.e., 1939-45, but some of the advanced/elite/secret weapons tech are those that were under active development during WW2 and their implementation extended into the following decade, i.e., circa 1946-55.
Suggestions for weapons and specialist ground units that are below regimental-size units, i.e., squads, platoons and companies, are below the existing level of of details and would add another order of magnitude of complexity to the game. I suggest that you focus your suggestions at the level of regiments, brigades and squadrons. I also suggest that you omit suggestions based on technology and/or tactics that are far outside the WW2 era, such as ICBMs, stealth aircraft, laser-guided bombs, etc. For those of you interested in the weapons tech of the Cold War and post-Cold War eras, Bytro has recently released a new game set in the modern era.