Seriously, it may seem counter-intuitive, but do less
work.
During my time, 2 platoons, mine and another did a hell lot of work
for everyone, and we did it well. Problem is, more work just kept
piling up and the quality expected of us increased too. There is a
limit to all this of course, I mean, at times we were expected to
do the impossible and stupid us did it.
Then it came to a point when we all decided it would stop. We told
our officers very clearly what we would do and the quality of work
we will provide, nothing more, nothing less. By then, of course we
had a good track record so we could negotiate that way. Funny thing
is, the last platoon did the least work, got the least work, and no
one said anything.
The 2 platoons who could work were simply given more to do and the
1 that couldn't, well, doesn't really matter does it?
The thing is, if you just show outright that you're not gonna get
the work done, chances are they'll give you less work. They won't
appreciate it if you keep meeting or exceeding their expectations,
so don't. If you feel guilty about not being able to provide
quality work, there are plenty of reasons why you shouldn't.
And yes, in the Army, rank wins all. So unless someone else with a
higher rank is willing to shield you, don't bother arguing.