I see a possible reply to my comments above that this is the road to a complicated game (defensive already, ain't I?, lol) and there are already others that do this. I do realise that detail has to give way to playability, but with some things the tactical and historical nature of a weapon or device is so overwhelming as to needing to be considered even within the framework of a simple and fast set of rules. For example, The comparison between the US 21" torp and the 24" LL torp is roughly twice the warhead (!) and three times the range (!!) of the US weapon. The batreps of the losing USN Captains was that they HAD to have run into a minefield at the same time as fighting a battle because torpedoes just couldn't go that far. They were right, US torpedoes couldn't but the Japanese ones could.
On the subject of the VT fused rounds comment, it was decided to risk the exposure of the top secret projectile in the defence of London from buzz bombs, previously only used over water because duds would sink and couldn't be captured and studied. Here is a bit of history that you brits might find interesting-
"During 1944 the intense warfare in the European theater of operations necessitated the lifting of the ban against the use of the fuze where it might be recovered by an enemy. On 12 June 1944 the first V-1 "buzz bomb" fell on London marking the start of Hitler’s massive effort to level the city by rocket. The all-out valiant effort of the Royal Air Force was not able to devise a good defense against this new weapon.
The Combined Chiefs of Staff reluctantly agreed upon the necessity of using the proximity fuze in the defense of London. Large numbers of anti-aircraft guns were moved to the channel coast where they could fire at the bombs over water. Success in destroying the V-1 rocket bombs by gunfire increased proportionally with the increase in the use of VT-fuzed projectiles. In the last month of the terrifying 80 days, 79 percent of the bombs engaged were destroyed as compared with the 24 percent destroyed during the first week of the attacks. On the last day of large-scale attacks only 4 Of 104 bombs succeeded in reaching their target. Some of the 100 destroyed are credited to the Royal Air Force and to the barrage balloons, but the majority of the V-1’s were victims of proximity-fuzed projectiles. There was little profit to the enemy with such a small percentage of success so Hitler turned the weapon on the port of Antwerp, which at that time was vital to the Allied supply lines. In the autumn of 1944 the devastating damage wrought while the Allies were redeploying anti-aircraft guns threatened to close the port. As the number of guns firing the proximity fuze increased, the damage decreased and the Allies were able to move their guns closer and to assume the offensive against the aerial targets. The defense of Antwerp resulted in the Combined Chiefs of Staff removing all bans against the use of the fuze which was most fortunate for the allied soldiers fighting there.
In late December 1944, von Rundstedt launched a counterattack which developed into the Battle of the Bulge. The use of the fuzes entered a new field, that of artillery fire against ground forces. The results of this usage was devastating to German troops and put fear into their hearts. No longer were their foxholes heavens against shrapnel burst, for with the use of the "funny fuze," as it was termed by General Patton, the shrapnel bursts occurred before the projectiles hit the earth, and high-velocity fragments rained down on the German attackers!"
One of the great things about historical gaming is the history we learn as a side effect, eh?