Degenerate principal series for classical and odd GSpin groups in the general case

Let Gn denote either the group SO(2n + 1, F ), Sp(2n, F ), or GSpin(2n + 1, F ) over a non-archimedean local field of characteristic different from two. We determine all composition factors of degenerate principal series of Gn, using methods based on the Aubert involution and known results on irreducible subquotients of the generalized principal series of a particular type.