How to Perform 9 Sets x 3\2\1 Waves?

Hi.
I’m currently on week 5 of the 12 week “12 weeks to war-ready guns” by CT.

I’m just looking ahead to the rest of the program and I’m confused on how to perform the following set (and other similar ‘wave sets’) in week 10:

A. Reverse grip bench press

Sets: 9
Reps: 3/2/1 wave (1 x 3, 1 x 2, 1 x 1, 1 x 3, 1 x 2, 1 x 1, 1 x 3, 1 x 2, 1 x 1)
Rest interval: 3 minutes
Special technique: none

Does the weight stay the same thoughout the sets for each exercise?
When do you use the specified rest interval?

Would I be correct in assuming its;

3 reps (bar down, rest for 2 mins)
2 reps (bar down, rest for 2 mins)
1 reps (bar down, rest for 2 mins)
3 reps (bar down, rest for 2 mins)
2 reps (bar down, rest for 2 mins)
1 reps (bar down, rest for 2 mins)
3 reps (bar down, rest for 2 mins)
2 reps (bar down, rest for 2 mins)
1 reps (bar down, rest for 2 mins)

…if so, am I right in thinking this exercise is aiming to improve my 1RM?

thanks
Dom

See http://www.T-Nation.com/tmagnum/readTopic.do?id=2140788
Basically, if you do the first set with 100lbs, the next set of 2 would add 10lbs, and then 10 again for the single set, then drop the weight back down to slightly more then 100lbs (like 105) for the next set of 3.