Solar power and LED lighting are being used by all branches of the military. Most notably, the Coast Guard, Army Rangers, and Marines. Most of it is designated for "deployable gear" and is used in the field. Home station units don't get priority, and end up using old surplus gear. Slowly but surely, LED lighting and fiberoptics will be the standard. It's a more efficient technology, and definately helps the bottom line, even if you have to invest a little more in the beginning.
Eventually, solar technolgy might become another standard. The only downside is the cost and waste of manufacturing solar panels. They are made from specially treated silicon tiles, and doping them produces a lot of chemical waste. At present, they are still ineffective at producing a large sum of power, but the technology is still in development.