no lah...
i hav checked out miw.com.and did dome homework...am too old for
chiong suah...those are actually combat specialist and being one
you can specialise in infantry (all riflemen), armour (learn to
drive tank , no repairs, lead a tank crew), commandoes (red headed
task forces of the army, cream of the corp), signals (lead a
platoon of radiomen or a node out to field), as a guardsman
etc.
i think engineering specs refers to technicians, service and
maintenance personel both in the field and workshops. they can
specialist in signal equipments, armour vehicles, weaponry and
small arms, ammunitions and explosives.
so if you sign on as a signal engineering tech, u probably will
break up a radio set or a series of communication and computer
devices and know them inside out should you need to fault-find into
it one day.
for an armor engineering spec (or perhaps technician as we call
it), you will need to know the armour vehicles you are responsible
for inside out i guess, keep it running and fault find it in the
field should it break down.
anyway there may be a likelihood that engineering specs (say armor)
specialising in a certain operation of a tank. i used to work for
XXX organization. they have designers who designa tank, welders and
welding inspectors to fuse the hull, mechanics and enngineers to
assemble the transmission shaft, dropbox, final drives, dampers,
braking, fluid and hydraulic systems etc, electricians and
electronics staff to connect the related electrical power circuits,
cooling, air exhaust system, lights and communication devices,
contract general workers to assemble the seats, dashboards and
external armour plates....u see lots of work to be done to make a
battle tank. 
