Moved database to new server, not sure about NT AUTHORITY\* users

I just moved database to new instance of SQL Server (SQL Server 2012 Web from Amazon EC2) and am now cleaning up database users.
I am not sure if/why these 2 users are needed (they exist in original database that someone else created and managed before me):
NT AUTHORITY\IUSR
NT AUTHORITY\NETWORK SERVICE
Note that there are also 2 database schemas with exactly the same names. These schemas do not contain any objects.
I am more clear on NT AUTHORITY\IUSR - this seems to be a user for IIS and IIS is not even installed on new instance (IIS will not be used). So this one probably can be deleted (together with matching schema?).
I am not sure about NT AUTHORITY\NETWORK SERVICE (or how it got created to begin with - new databases created on new server don't have it. Newly created databases don't have NT AUTHORITY\IUSR either).
Neither of these 2 users exist at server level on a new instance or on an old instance.

BOL says
Local System account. The name of this account is NT AUTHORITY\System. It is a powerful account that has unrestricted access to all local system resources. It is a member of the Windows Administrators group on the local computer, and is therefore a member of
the SQL Server sysadmin fixed server role
Network Service account. The name of this account is NT AUTHORITY\NetworkService. It is available in Microsoft Windows XP and Microsoft Windows Server 2003. All services that run under the Network Service account are authenticated to network resources as the
local computer.
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
MS SQL optimization: MS SQL Development and Optimization
MS SQL Consulting:
Large scale of database and data cleansing
Remote DBA Services:
Improves MS SQL Database Performance
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Business Intelligence

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Moved database to new server, not sure about NT AUTHORITY\* users

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