How to make a Manchurian Candidate.  

{I am going to assume the candidate is male.  It is quite possible for
female.  However, it's a hell of a lot easier to write with only one gender
in mind.}

Here is how I would do it.

First off, we need the ideal subject, someone who wasn't planning on being
in the military -- it was never his life-long dream -- but once there, the
soldier turned out to be really excellent at it.  The reason this is ideal
is that we're going to build two diametrically opposite belief systems in
this individual:  One where the person maintains that he's opposed to
unnecessary violence, and one where he's exceptionally excellent at
delivering what is perceived by others as violence, but he does not
perceive it as anything more than following orders.

The conditioning would be better if the subject were willing.  However, as
the movie goes, the conditioning comes to a person who was not willing.

There are four ways to get someone into a subconscious state (SODA:  Shock,
Overload, Deception, Anticipatory).  To move this person into a
subconscious state without his permission, we will begin with overload.  

The candidate will have to be run by someone who is perceived as a superior
officer.  In this way, the person is already conditioned to follow orders,
which is a requirement of the military.

Now, overload begins with tasks that require both physical and mental
concentration.  By compounding the tasks so that there are more and more
demands placed on this same individual, what happens is that the person, at
some point, will discover that he can't consciously concentrate on
maintaining all the tasks all at once, so he slips into a subconscious
state, which easily processes all the tasks, but then becomes more
susceptable to control, especially if he's unaware that he's shifted from a
conscious state to a subconscious state (the easiest way I know is that my
perception of time shifts)

For example, give the candidate a crash course in shapes, textures and
colors of paint, as well as a symbolic interpretation of each shape of sign
and the underlying meaning of colors. This is to create a foundation of
chaos. Next, put the candidate on a march that runs an inevitable lap, so
that the starting point and ending point is the same.  Put a set of
headphones on the candidate so you can give additional orders to the person
while he's marching, as well as two CCD video cameras, one to watch his
face at all times and the other to watch where's going.  We need this to
watch for signs that the person is passing into a subconscious state, as
well as knowing where in the field the person is

Around this track, you will need to place pictures, billboards, symbols and
other visual distractions.  There must be an odd number of signs, less than
a hundred, and prime.  In this way, there's no actual pattern the person
can use to break the strides into exact steps between signs and the
parameters of the overall march.  This adds stress.  I would recommend no
less than 53 signs nor more than 83.  Have these signs in all forms of
shapes, colors, and messages.  Have only eleven of the messages infer the
mindset you want your killer to believe.

As the runner goes around the lap the first time, do not make any reference
to the signs for over half of the lap, then demand that the candidate count
all of the yellow signs with blue lettering that have the word "refrain" in
them.  Next, just as the person gets to the starting line, add the next
command, and when he gets past just five signs, add the next, and the next,
while commanding that the person will get tested at the end of the run.  
What we're going to do is to program him from a suggestion of individual
words that he's picking out of these signs.  Thus, anyone looking at the
messages will see nothing out of the ordinary in the messages, but our
candidate will be asked to find each of these words over the course of the
run "Refrain, from, questioning, authority..." and whatever message you
want delivered to most tweak the ultimate mindset of your killer.

At some point, the person will hit overload.  At that point, the person's
eyelids will flutter, and then this candidate will go into automatic pilot,
for the majority of the candidate's mind will go into a hibernation state
while the physical demands will remain in motion.

It is at this point where the actual programming can begin.

Does anyone have an interest in this thread?  From here, there are many
levels of conditioning that need to take place, mostly from the invocation
of imagination as a vivid and vital tool of reprogramming, but it would
take a bit of writing.  If there's no interest, I don't want to waste my
time.

Let me know.

Peace,