None
Nitroguanidine is the explosive incorporated in the Navy's double based propellant powder, SPCG. It is unusual in being a high explosive that is so cool in its reaction that it explodes without flash. It is comparable in strength to TNT, and its sensitivity is of the same order.
TM 9-1300-214, Military Explosives (w/C4, 1990)
OP 1664, Volume 1 - US Explosive Ordnance (1947)
USNBD - Bombs and Fuzes, Pyrotechnics (1945)