The most important role filled by Alamo class frigates is reconnaissance. For defense, fleets surround themselves with spheres of scouting frigates scanning for enemy ships and transmitting warnings to the main body.
Alamo Frigates achieve high FTL cruise speeds because of their high-performance drives. They also have proportionally larger thrusters and lighter design mass, allowing them greater maneuverability. In combat, speed and maneuverability make frigates immune to long-range heavy fire of larger vessels.
In fleet combat, frigates are organized into “wolf pack” flotillas of four to six. Wolf packs speed through enemy formations, hunting enemy vessels whose kinetic barriers have been taken down by fighter-launched disruptor torpedoes. The wolf pack circle-strafes vulnerable targets, using their superior speed and maneuverability to evade return fire.
Alamo frigates are in service since the Year 2180. There are two versions out there. The older Mk1 class wich had a larger engine and the Mk2 which has benefited from the human/turian joint venture efforts of building the Normandy SR-1. The Mk2 has a more powerful Mass Effect core which has the same drive power in smaller engines. The saved weight makes it a bit more agile than the Mk1.