[Retsof]

I can't get this to show up right in the mission.  It is the classic "big ship coming, take out the beams" scenario.  The directive is there at the beginning of the mission instead of when the ship jumps in, and it gets fullfilled as soon as it arrives.

[FUBAR-BDHR]

Get rid of the has-arrived-delay its smart enough to know not to put it up until the ship arrives.  Also why 2 ands?  you can add as many arguments to one as you want.

Like this

when
-->and
--->is-subsystem-destroyed-delay
------>invidia
------>turret01-base
------>0
--->is-subsystem-destroyed-delay
------>invidia
------>turret02-base
------>0
--->is-subsystem-destroyed-delay
------>invidia
------>turret03a-base
------>0
-->do-nothing

[Retsof]

Oh, I thought you needed a new "and" for each thing.  Let's see if this works.
EDIT:  Okay, it worked, but why is there no little "3" next to it?

[FUBAR-BDHR]

That only works with certain sexps as far as I can tell. 

[Retsof]

Ah, that makes sense, it probably only works when dealing with multiple ships.