Brian Thorn wrote in
:

On Thu, 31 Jul 2003 15:09:42 GMT, Brett Buck
wrote:

Whether dual-string capability is required, or merely highly
desirable, could potentially be debated, but I bet they won't make that
mistake again.

We don't have true dual-string capability... both vehicles are
dependent on the RL-10 engine. There's been some work on a different
upper stage engine to provide true dual-string, but in today's
unprofitable market, I wouldn't bet on it ever getting off the ground.

The RL60 will begin testing this summer. Don't know the status of
the MB-60/MB-35.

--Damon