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LTE: Why security header type is defined "1100" only for a special NAS message i.e Service Request message ?

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I was looking into NAS header. First four bits are used for security header type. Few values I understood but one value I could not understand which was 1100 saying "security header for service request message". I could not understand why such thing is defined only for service request message not for the other messages ?

posted Sep 28, 2016 by Neelam

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NAS Attach Complete message contains 2 security header type IEs and 2 protocol discriminator IEs

Asked the same on LTE University, just repeating the same here.

I was wondering if you can help me with this issue: I don't understand why the Attach Complete and other NAS messages contain more than 1 Protocol Discriminator IEs and more than 1 Security header type IEs. Are these IEs correlated with the following ESM message container or what could it be the cause?

Here you can find the hex stream of my Attach Complete (only the NAS PDU) packet:
270000000001074300035201c2

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