ARNG – NGR 600-100, para 13-4, 13-5; AR 611-201, para 7-5
USAR – AR 601-210, para 10-7d; para 10-8d; Table 9-9, Enlistment option 9-H: AR 37-104-10, para 2-13
SMP participants serve in ARNG/USAR units in the rank of “cadet” and receive drill pay in pay grade E-5 (higher, if higher enlisted rank held prior to contracting).
SMP participants who are disenrolled from ROTC advanced Course will return to the grade and rank held prior to SMP participation.
http://www.suu.edu/business/rotc/smp.html
As a officer cadet you are no longer 'enlisted personnel' but your pay grade is E-5.
As a cadet, you are not however a NCO for military courtesy. When a NCO enters an area of junior enlisted soldiers or cadets, the room is called to “at ease”. All personnel should immediately go to the position of “stand at ease” until told to “carry on”. Likewise, when speaking to an NCO, soldiers junior in rank or cadets, will maintain the position of “parade rest” until instructed to “stand at ease”, “at ease”, or “rest”/relax.
(my understanding is that this is a result of the Geneva Convention, in time of war, a cadet who is pressed into service is technically a NCO and is then treated as a NCO - if cadet becomes POW)