GTM MX-50
Available for all space battles, defensive and offensive; medium payload (16.5 Kt); infrared tracking and semi-intelligent targeting; pilot chooses desired target, and the MX-50 tracks the chosen target based off the emission of heat from the engine, the weapon bays, and the cockpit of the target ship; the MX-50 will always attack a target that is determined to be hostile by the onboard computer of any GTA combat vessel, thus ensuring a higher kill rate, should the pilot find himself in a heated battle situation where precise aiming might be difficult.
GTM - 31 DISRUPTOR MISSILE
Advanced signal processing; high precision interception capability; small payload (9 Kt), combining both conventional explosives and a localized blast of energy caused by the effect of impact upon the laser-propulsion system of the missile; designed to temporarily disable subsystems on hostile targets.
GTM - 2 FURY
Small, fast dumbfire missiles; fired in swarms; GTA fighters can carry more Fury missiles than conventional missiles, due to their small size; used for distraction and other tactical measures; very small payload (3 Kt).
GTM - 4 HORNET
Infrared and ultraviolet tracking; designed to fire in small groups of 4 missiles per burst; light medium payload per missile (12 Kt); semi-intelligent on-board tracking; single-pass kill probability will not
exceed 60% on average; designed as an offensive version of the Fury.
GTM - 9 INTERCEPTOR
All-aspect seeking; laser tracking senses energy reflected off a target from the primary weapon systems of the target, increasing single-pass kill probability; medium payload (18.5 Kt); missile is designed to pierce
reinforced hull, thus securing itself to the target, prior to detonating (15 ms delay).
GTM PHOENIX V
All-aspect seeking; same tracking system as the Interceptor; large payload (50 Kt), but somewhat slower than the Interceptor; one of the best fire-and-forget missiles ever developed; many fighter pilots within the GTA regard the Phoenix V as the weapon of choice against high value, heavily defended targets.
GTM - 1 SYNAPTIC BOMB
Missile propulsion unit carrying several small intelligent "bomblets"; when distance to target is less than 100 m or when time to impact is less than 2 sec., bomblets direct missile to the most vulnerable part of the ship of those parts of the ship facing the missile; bomblets then separate from missile propulsion unit and form a sphere; inertia continues to carry bomblets in the direction of the target; the missile propulsion unit
continues to advance toward the target; when the missile hits the target or 1.5 sec. after the missile should have hit the target, the bomblets explode; the spherical shape of the formation of the bomblets helps to ensure a fairly even level of damage across a sensitive area on the target; the spherical shape also ensures that the target will not be able to effectively maneuver away from the blast, thus "pinning" the target to a specific area in space; can also act as dumbfire; medium payload per bomblet (15 Kt); very small payload for missile (2 Kt).
GTM - 43 STILETTO
All-aspect seeking; laser tracking similar to the Interceptor; missile is protected by a small shield system, allowing for greater success in payload delivery during busy melee situations and intense firefights; fast, but low in-flight maneuverability compared to other missiles of comparable size; low maneuverability due to the size of the missile’s payload (60 Kt) and on-board shield system.
GTM - 3 TSUNAMI
Intelligent tracking similar to GTA targeting system; prior to launch, communicates with ship computer, gathering data about enemy target types and whereabouts; slow, low maneuverability; antimatter warhead (500 tonne3 mass-to-energy conversion); due to instability of antimatter, no more than 6 may be carried on board a GTA bomber at any given time, unless pilot is granted a special permit by an appropriate governing body or pilot is to participate in a glory mission.
GTM - N1 HARBINGER
Fusion bomb surrounded by 3 salted fission bombs; propulsion unit is a half-size version of a regulation GTA fighter thruster (Class II); given the weight of the payloads, the missile is slow despite the power of the thruster; as the Harbinger is exceptionally large, GTA fighters and bombers are limited to carrying 2 of these weapons at any given time; the resultant shock wave from this weapon is potentially deadly, due to the size of the payloads (5000 Mt in total); use near allied installations or allied ship groupings is strongly discouraged by the GTA; most effective when used in preemptive defensive strike against non-military installations.
3kt is a small payload?! Hiroshima bomb with 13kt, apparently......
EDIT; and by the last line in the description (as well as being 5000Mt!!

), the Harbringer sounds almost like a planetkiller