Given the two designs:
https://elements.carbide3d.com/category/us_armed_forces/seabees-logo-1.svg/
and
https://elements.carbide3d.com/category/us_armed_forces/seabees-logo-2.svg/
which import as:
It is not possible to simply select and close the open vectors because they do not describe region(s) which are closed.
It will be necessary to edit geometry so as to create such a description…
The open geometry:
shows that what is needed is geometry along these lines:
which will require cutting off some geometry:
which will need to be inset to make up the section which is removed:
Apply
Use Nod Editing to isolate the regions in question:
Done
Delete what is not wanted:
and then draw in geometry to close gaps:
Use Trim Vectors to adjust:
OK
OK
Join Vectors
Yes
Repeat for the other sections, if need be offsetting to the outside:
Apply
Delete sections which are not needed:
and draw in additional geometry:
and use Trim Vectors to resolve things:
until one arrives at:
OK
OK
Join Vectors:
Attached as a v8 file:
SeaBees Logo 1.c2d (128 KB)
The other file is much the same.
Fix areas where the file does not describe the desired closed region:
Deleting temporary geometry as one works:
