Yes, I thought you meant ENEMY APh. In the FRIENDLY APh, S3.31 (Hold attitude) way (b) says a S? can be activated by proximity and net IFT DRM "advancing FRIENDLY Target", and S3.32 says S? in Advance attitude can be activated in the same ways as one in Hold attitude.
I can't find a rule that says the units generated when a S? is Activated are unconcealed. The S? itself is a type of "concealment" (S3.1), and the mention of "retaining concealment" when activated in S3.32 (b) makes me think that units generated from a S? Activated in the FRIENDLY APh may be (stay) concealed.
I haven't played SASL in a long time; I can't remember how I played it.