List of 6-year ortho programs?

Updated from above:

6 year for all residents:
UCSD
SLU
Brown (one year as a junior faculty, not research)
Union Memorial (includes 6 month FDA externship)

6 year for 1 or 2 of the residents per PGY class:
UCSF
UCLA
UC Davis
USC
UCONN
Boston U
UNC
Dartmouth
Rochester
Ohio State
U Penn
West Virginia
Case Western

Updated from above:

6 year for all residents:
UCSD
SLU
Brown (one year as a junior faculty, not research)
Union Memorial (includes 6 month FDA externship)

6 year for 1 or 2 of the residents per PGY class:
UCSF
UCLA
UC Davis
USC
UCONN
Boston U
UNC
Dartmouth
Rochester
Ohio State
U Penn
West Virginia
Case Western
UMass

When including the schools that offer a research year to 1-2 students per year, is it random, or do those interested apply? And if selected, does it then become mandatory?

What if no one wants to do a research year from that class?

Pitt has a 6 year track for 4 of its 8 residents each year

Schools can do it in different ways, but many programs where the research year is not mandatory have separate ranks in the match and will have a certain number of spots for the 5-year and a certain number of spots for the 6-year program. This sorts by applicants who have no interest in the extra year, though many who really want to go to that school will rank the 5 and 6 year positions back to back.

I don't understand why people would want to do a 6 year program. Is it to make themselves more competitive for fellowships?

If it is, what if you already have 10 small pubs. Would an extra year help?