GR translation: and saw his friend on to Peenemünde—saw him on?

[Mike Jing]

V586.40-587.6   Last we saw of Fibel he was hooking, stretching, and
running shock cord for that Horst Achtfaden back in his gliding days, Fibel
who stayed on the ground, and saw his friend on to Peenemünde—saw him on?
isn’t that a slice of surplus paranoia there, not quite justified is
it—well, call it Toward a Case for Bland’s Involvement with Achtfaden Too,
if you want. Fibel worked for Siemens back when it was still part of the
Stinnes trust. Along with his design work he also put in some time as a
Stinnes intelligence agent.

What does "saw his friend on to Peenemünde" mean exactly?  Is the "saw him
on?" that follows a pun?  And if it is, what does it mean?
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