"The M110 can stop and fire the first round from travelling within one minute.
This artillery system carries no defensive armament, except individual weapons carried by the crew.
This self-propelled howitzer has a crew of 13, however only 5 men are carried by the M110. Support crew of 8 men are carried by an escorting armored personnel carrier, which also transports ammunition for this SPH."
Source: http://www.military-today.com/artillery/m110.htm