to attack, this system as a whole has the por^'erful advantage of virtual invulnerability as long as the submarines are travelling undetected. uld.er the ocean surface. At present o no nation is hnovn to have an anti-submarine capabifity that thr.eatens this invulnerability. In conpanison rdth the ICBI4? hovever " the SLBl,Is are considerecl to have a nore tenuous conrnunication ]ink with the national corunand authori.ty, particulat'Iy under wartime conditions. Also, they are for the tirne being less accurate than their land-based counterpart, partly because of the uncertaintty of the .;ubmarine's deternination of its location, orientation and velocity, Thus tlre SLBM is not at present suited to attack sma1l 'rhard.'r targets (e.g. nissile silos), but could be utilized against larger and "softer" tatgets - such as nilitary bases" air fields and population centres. They are thus not consictered destabilizing in the sense that the accurate I{IRVed ICBMs may be' However, because of the possibility that the attacking submarine may come quite close to some ta?6ets, warning of an attack could be considerably less than for ICIM missiles. The SLIMs af,e therefore ccnsidered to be a serious threat to bonbers which might hav€ time to f1y out from under an ICBM attack. 25. .:! thir4 nethod of nuclear-weapon d.elivery, emphasized. more by the 'united states than the ussR, is by long-range bomber. \,trith sufficient varning, the united states bomber force woufd c&rry betl,reen one fourth anal one third of all delivetable United States strategic nuclear weapons e adding up to perhal's half the total megatonnage I while the Soviet strategic nuclear payload is concentrated. in its ICBMs. The bombers could carry either gravity bombs or various aerodyna:tic or "cruise" missiles. The latte" can be fired from a "staltl- off" position, i.e. without the bomber penetrating the enemyrs air 'lefences,which enhances the operational survivability of the syster0. The manned bonber
**Analysis**
This text appears to be discussing the strategic capabilities of nuclear-armed submarines and bombers, and their potential impact on national security and warfare. The language used is technical and military-oriented, suggesting that the text is focused on military strategy and tactics rather than any of the other categories.

**Category**
Science and technology, International relations