Some perspective from the regs:
AR 623-3 Ch. 3-7b(2)
(c) The rater will assess the performance and potential of the rated NCO, SGT through CSM, using all reasonable means to prepare a fair and correct report that accurately reflects an evaluation of the NCO’s duty performance, values, NCO responsibilities, and potential.
AR 623-3 Ch. 3-24
(2) The rating chain should note the status of a rated Soldier’s rehabilitation progress or outcome in the current
evaluation or in later reports.
b. A rated Soldier who voluntarily seeks mental health counseling or is entered into a mental health care program for behavioral health issues that have not been detected by the chain of command will not be penalized by mention of this participation in a behavioral health treatment program in an evaluation report. Doing so would discourage selfreferral to obtain assistance from health care professionals when problems exist. In accordance with the Army’s behavioral health goals, leaders should support and encourage Soldiers to obtain the necessary assistance for behavioral health issues (para 3–5b(2)(c)). This lessens the stigma associated with issues that warrant psychological care and treatment. Behavioral health issues include a variety of unusual or inappropriate behaviors that may be associated with post-traumatic stress disorder, mild traumatic brain injuries, combat stress or other stress, and/or suicidal thoughts or tendencies. Once a Soldier has been identified in an evaluation report as having mental health issues based on information obtained independently of any information from health care personnel—
(1) Voluntary entry into mental health counseling or a mental health care program, or evidence of successful treatment to remedy the original behavioral health issue, will be mentioned as a factor to the rated Soldier’s credit.
(2) The rating chain should note the status of a rated Soldier’s behavioral health improvement and/or maintenance of an improved status in the evaluation report covering the period during which the Soldier’s status improved.
So you can/should honestly rate this NCO, and potentially protect his future through the inclusion of his enrollment into mental health programs.
Good Luck with this.