They first went into service right after the Battle of Geonosis
and the merge of the Clone Wars, trained by Republic Commando Demolition experts,
these troops are spread throughout battalions and legions,
with different armor of choice,
(by their leigon/battalion, ETC.).
They are refered to rocketeers,
never seen without a rocket launcher, rather than never having one.
They are also armed with a hand blaster in case of ammo shortage,
and either a DC-15 blaster/rifle,
or a DC-32 Sub-Machine Gun made by weapon experts on Kamino,
made especially for the EDH Trooper.
Some were trained as ARCs, also to provide rocket power to ARC need.
"There was an old rumor 'bout those E boys, one named Grease,
never failed to complete his mission.
He was such an ace, he was pulled into one of those RC squads, all them beast.
He was the demolitions expert on that squad.
Always clung onto that rocket launcher of his.
His squad was sent to assassinate Grievous.
It all ended for him when he himself took on 7 of them Magnaguards,
all the rest of his squad dead.
He couldn't take it, no, he didn't care at all.
When Grievous came 'long, that F boy pulled the trigger on his launcher,
which he called "Laura", and busted the heck outta those guards,
but as always, Grievous got away, with 7 scrapped droids, and a dead ner vod."
- Anonymous clone