Your latest sleep doc was right. You should have been on CPAP since 2005. Weight loss alone often does not "cure" sleep apnea.
On the militarty questions. I am not a veteran I happen to be a long hual over the road truck driver with sleep apnea. I deal with many of the practical issues you raise in your post.
Some of the problems you are facing may be related to what is on this article.
I disagree with many of the points raised.http://www.stripes.com/news/veterans/at ... e-1.223588
I have reached out to a driver friend who is a former Navy Seal who drove truck and now works for a driver advocacy group. Hopefully he may be able to add some more useful information.
My understanding is that having OSA does affect your deployability. I have worked with other soldiers fighting a determination that they could not deploy with their units to a forward base. (The exact opposite of what you are trying to do.)
On all of the practical issues the real question is are you willing to accept the fact that having OSA will create some inconveniences you will need to work around ... or ... are you trying to use having sleep apnea as an excuse to never be deployed.
I have been dealing with the practical issues of having OSA in a sleeper berth equipped truck for 11 years now. They can be managed.
Transcend is a battery operated portable CPAP. It has been used by soldier deployed to forward bases in Iran and Iraq. The company even did some in a desert digital camo pattern for some that requested it. CPAP use DC power internally so foriegn power supplies are not an issue. Most CPAP are sold internationally.
CPAP can be used in dry dusty environments. You just need to clean or change the air intake filters more often. Augmenting humidification with nasal irrigation (see forum stickies) also helps.
A common sense precaution is to carry a spare mask. I carry a spare CPAP but have only had one CPAP failure in 11 years. It was in 2002 before many of the improvements to CPAP design were available.
I could go through all of the other objections you list. They all can be dealt with if you try.
You need to decide. Is having sleep apnea going to be something you use as a crutch or excuse to avoid deployment or is it something you are going to deal with and work out the issues and problems around.
Having sleep apnea is something you need to accept will be with you for the rest of your life. It can be handled and you will feel so much better on treatment you won't want to even think about not using a CPAP.
On the other hand it may effect your military career. OSA has affected my career in trucking. I chose to work out solutions to the problems and now try to help other find solutions to there's. You need to decide which approach you are going to take.