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May 20, 2010

Torpedo damage and the sinking of the Cheonan

Filed under: Asia, Military — Tags: Korea, Movies, Navy — Nicholas @ 12:18

Geoffrey Forden posted information on likely causes of the sinking of the South Korean frigate Cheonan before the formal report was released:

One of the “mysteries” surrounding the sinking of the ROK’s warship, Cheonan, is that the explosion split the ship in half, a result our popular culture has trained us to forget. After all, World War II movies always show a torpedo strike in the same way: one or two white streaks quickly approaching the ship followed by a localized jet of water where the torpedo struck the hull. Sailors stream out of their bunks to jump over the side as the ship keels over, taking in water. Below the water line, jagged holes, punched by the explosive force of the warhead, let in sea water. Compartments quickly (or if dramatic effect is needed, slowly) fill with water, drowning all the bit players, uh, sailors trapped below.

These movies have influenced our expectations for the damage caused by modern torpedoes even though there are much more efficient ways for a torpedo to destroy a surface ship. [. . .]

The second major effect damaging the hull, and probably the one that caused the vessel to break in half, was a jet of water blasting its way through the ship. This jet was formed as the gas bubble created by the initial explosion collapsed upon reaching the ship’s hull.

This is the way modern torpedoes sink ships. Everything about the Cheonan’s sinking is consistent with either a torpedo or submerged mine blowing up beneath the ship’s keel.

Fascinating though this is, the official report (as filtered through what was made available to international media) discounted this mechanism:

South Korean scientists at the Sound Engineering Research Lab of Soongsil University have performed an analysis of the acoustic signals (the media report mistakenly calls them seismic waves) associated with the sinking of the Cheonan. It would be very nice to see their actual analysis — and the data would be even cooler — but it appears on the face of it to be a very interesting result. Their main conclusion, again based solely on the media report of their findings, seems to be that the Cheonan was actually struck by a heavy torpedo. (The say the most likely candidate is the Chinese Yu-3 heavy torpedo with a 205 kg high explosive warhead.) According the article, the South Korean scientists believe the torpedo struck the hull of the Cheonan but since the explosive is significantly aft of the torpedo’s bow, the center of the explosion was a little over 2 meters away. They rule out the “kill mechanism” being a bubble jet.

Interestingly, a summary in New Scientist (which is where I found the link above), seems to have been written before the updated information was added to the original post, as it attributes the sinking to the “deadly bubble jet”.

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August 29, 2012

South Korea’s slow move to a smaller, more professional military

Filed under: Asia, History, Military — Tags: Army, Borders, Conscription, Demographics, Korea — Nicholas @ 09:33

With a belligerent and unpredictable neighbour directly to the north, South Korea still maintains a large conscript military force. The government hopes to transition over time to a significantly smaller volunteer structure:

Six years ago the plan was to reduce troop strength 26 percent (from 680,000 to 500,000) by 2020. Then politics and North Korean aggression kept halting the reductions. Meanwhile it became clear that the birth rate was going lower, not increasing and within a decade there would be a lot fewer young men to conscript. At the same time the booming economy was producing more money, and technology, for more effective weapons and equipment that can replace soldiers. Another key element was that conscription was increasingly unpopular. The current crop of conscripts had parents who were born after the Korean war (1950-53), and only the grandparents (a rapidly shrinking group) remember why the draft is still necessary. Most of todays’ voters want to get rid of the draft. But when it comes time to actually make cuts, North Korea manages to change the subject.

Then came 2010, a year in which North Korea sank a South Korean corvette (which they denied, but the torpedo fragments recovered were definitely North Korean) and shelled a South Korea island (the northerners bragged about that). Since then, there has been more opposition to reducing military strength. But conscription is still unpopular and there are simply not enough young men to maintain current strength.

Meanwhile politicians are responding to public opinion and shrinking conscription service. It now varies from 21-24 months depending on the service. More conscripts can now serve in the police or social welfare organizations (for 26-36 months). Eventually, South Korea would like to have an all-volunteer force. But that won’t be affordable until the armed forces are down to only a few hundred thousand.

The Korean peninsula is one of the last remaining outposts of the Cold War. The sinking of the ROKS Cheonan is the most obvious sign that the two sides are still not at peace (the Korean War didn’t really end … it’s merely resting). Occasional shellings and attempted infiltration by North Korean special forces are frequent enough that they don’t get much international coverage. North Korea frequently accuses the South of similar kinds of provocation.

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September 1, 2010

T.R. Fehrenbach’s This Kind of War

Filed under: Asia, Books, History, Military, USA — Tags: Korea, KoreanWar — Nicholas @ 12:01

Austin Bay recommends a book first published in 1963 as still being the best single-volume history of the Korean War (and I agree):

June 25 marked the 60th anniversary of North Korea’s premeditated attack on South Korea. The attack, which scattered South Korea’s weak and disorganized defense forces, began a vicious two and a half months of combat. The North Koreans would smash the ill-starred U.S. 24th Division’s Task Force Smith, then shove remnant South Korean troops and U.S. reinforcements into the Pusan Perimeter, at the southern tip of the peninsula.

In the weeks since June 25, I’ve re-read T.R. Fehrenbach’s “This Kind of War,” still the premier Korean War history. (Clay Blair’s “The Forgotten War” is also an excellent book.) Published in 1963 and reissued in 2000, “This Kind of War” is lyric history, delivering analysis in elegant, honest prose. Fehrenbach is also a decorated Korean War veteran, a man in touch with the emotions as well as the facts.

“This kind of war,” Fehrenbach writes, “is dirty business first to last.” Fehrenbach’s commentary on those first battles of July and August 1950 depicts the confusion of initial defeat and retreat, as well as the courage and intellect required to stem the onslaught. His chapter on the Inchon landing of September 1950 — the American amphibious counter-stroke — is incisive. Its 60th anniversary is two weeks away.

I think I first saw This Kind of War recommended by Jim Dunnigan, many years ago, but the Korean War has never been a major historical interest of mine. When I did get around to reading the book, it certainly opened my eyes. As Bay points out, the work is still topical because the war has never officially ended (as the sinking of the ROKS Cheonan amply demonstrated).

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May 21, 2010

“Courageous Channel” exercise cancelled in South Korea

Filed under: Asia, Military, USA — Tags: Army, Korea, Navy, Seoul — Nicholas @ 09:07

Strategy Page reports that a regular exercise has been cancelled to avoid further raising tensions between North and South Korea:

In South Korea, the semi-annual American evacuation (for American civilians) exercise has been cancelled. This was because relations between North and South Korea are particularly tense. It was felt that this exercise, which involves setting up the 18 evacuation points and having 10,000 people actually go through some of the procedures involved during an evacuation, might make the unstable North Koreans do something rash. The tension is the result of North Korea torpedoing a South Korean warship two months ago, killing 46 sailors. The North Koreans officially denied they did it, although North Koreans have been congratulating each other about it, and the North Korean general in charge of such things was very publicly promoted for no particular reason. Recently, South Korea announced it was certain the ship was sunk by a North Korean torpedo. North Korea called that accusation an insult and threatened war.

Called Courageous Channel, the evacuation drill has been held twice every year (in the Spring and Fall) since 1996. That was when someone noticed that there a lot more U.S. citizens living in South Korea, particularly in and around the capital Seoul. This city contains a quarter of South Korea’s population, and is a primary target for any North Korean invasion. The city is within range over a thousand North Korean guns and rocket launchers. If there were an actual evacuation, some 140,000 American citizens (and some non-citizen dependents) would be moved south.

The report on the sinking of ROKS Cheonan was issued earlier this week.

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