Let's observe the pattern in the series:
The first letters in each term: B, E, H, the pattern is increasing by 3 (B + 3 = E, E + 3 = H, H + 3 = K).
The second letters in each term: M, O, Q, the pattern is increasing by 2 (M + 2 = O, O + 2 = Q, Q + 2 = S).
The third letters in each term: O, Q, S, the pattern is increasing by 2 (O + 2 = Q, Q + 2 = S, S + 2 = U).
Thus, the next term should be "KSU."