Zoombie, some of those sounds are good, and some are bad.
But generally, they are too
short. You either need lots of different sounds which are similar or longer sounds.
The reason for this is that these are
ambient sounds, so you aren't meant to play them to
replace sounds, but rather when the camera pans near them.
That is why some of the sounds that Cobra disliked aren't that bad (aircraft carrier does suck), because you won't hear them like that in game; you will hear them fade in and fade out depending on your distance from the unit.
Zoombie, its a start, but you've still got a helluva long way to go. You will likely need upwards of 50 soundbytes before you've made a good inroad at filling in Spring with ambient sound. Because you aren't finding sounds just for when the units are clicked, you are finding sounds that will play
simply because the unit went by. That is a lot of sounds.
For an example, consider Kbots marching. You can get a marching sound of a single kbot walking along. But this wouldn't suit all kbots, some walk quickly, and some walk slowly. Some zip along (zipper), while some slowly plod (sumo, krogoth). All would need completely different sounds.
And those are individual sounds.
The sounds also have to work when a whole army is marching together, and should sound something like Total War's marching armies.
And that is just marching; you will need to get hold of some electronic grating sounds (like the sound of a tank turret moving in Battlefield 1942) for when units are moving pieces.
Of course, kbots would be the hardest units to do, so don't get too intimidated; vehicles and aircraft would be significantly easier.
Basically, you want filler sounds. Sounds that will play to fill the Spring world with atmosphere. Therefore, you
don't need bullet sounds and the like,
because there are already bullet firing sounds in TA. Why increase your workload? You need jet engine sounds, and tank catterpillar tread sounds, and nanolathe sounds, which only play when you get close to that unit.
Also, don't forget to get sounds that aren't just for units, you also need the sound of water trickling (rivers), wind blowing through grass (plains), trees shuffling and birds tweeting (forest), a low metallic hum (metalworld), bubbling lava (marsworld), etc.
When you are looking for sounds, don't look in your favourite games, look in the most relevant games. Often the most crap games in terms of gameplay put in heaps of effort in terms of soundfiles; so look for games with robots, tanks, ships and advanced aircraft.
For example, some of the homeworld sounds (not that homeworld is crap) are excellent, and would work very well with TA's ships and aircraft.
And by all means try and get at the ambient sounds in all three total war series. There are some great ambient sounds in there related to natural elements, such as wind, river, grass as well as the more obvious marching, etc.
Have a look at the sounds in Sid's soundmod for some really nice electronic sounds. I've uploaded .wavs in a zip at fileuniverse:
http://www.fileuniverse.com/?page=showitem&ID=858