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Bud crosses over twice into episodes of NCIS : the season 1 episode "Hung Out to Dry" and the season 14 episode "Rogue". In the latter, set 11 years after the finale of the JAG series, he is now a captain and still a JAG officer.
The last JAG in the series, he succeeded RADM A.J. Chegwidden upon his retirement in 2004. He was a very tough leader who also showed a low-key sense of humor and eventually won over the JAG officers.
When Harm becomes the foster dad to Mattie Grace, and needs a larger apartment for them to live in, he persuades Coates to move into the two-bedroom apartment next door so that Mattie can live there with her. (Coates had difficulties with her 4-5 female roommates; Harm inveigled Coates to be Mattie's roommate by paying Mattie's expenses – though his original offer was to pay all costs for both Coates and Mattie). Harm wanted Coates for Mattie's roommate as he felt that Mattie, being a teenager, would need a female role model.