Number acronyms from a quiz - help needed!?

21 D is the WS
4 P on a D
1739 DTH in Y
1 AN of H
2000 LEO
5 CB in a BS
10 E in a D
49 N in the NL
24 W on an AC
0 T on a MC
7 P in a NT
4 C in the HH
7 LGS in the BSK and a HWF
2 TT from T
6 S in a TP 'P'

Thank you!!
4 answers 4