Task: Data-Imputation (source dataset: WebTable)

Please fill in the missing value in the input table. The missing value is denoted by '[MISSING]'. Please only return the value filled in. Do not return the whole table.

No explanation, return the value filled in JSON format: {"value": "filled_value"}. 

Input Table:
| Country                  | Armed Forces                | Air Force          | Army   | Naval     | Designation Systems          |
|:-------------------------|:----------------------------|:-------------------|:-------|:----------|:-----------------------------|
| Afghanistan              | -                           | all                | -      | -         | nan                          |
| Albania                  | -                           | all                | -      | -         | nan                          |
| Angola                   | -                           | current            | -      | -         | nan                          |
| Argentina                | -                           | all                | -      | all       | nan                          |
| Australia                | -                           | all / current      | all    | all       | nan                          |
| Bahrain                  | -                           | current            | -      | -         | nan                          |
| Bangladesh               | current                     | current / historic | -      | -         | nan                          |
| Belize                   | all                         | -                  | -      | -         | nan                          |
| Bolivia                  | -                           | all                | -      | -         | nan                          |
| Brazil                   | current                     | -                  | -      | all       | nan                          |
| Brunei                   | -                           | all                | -      | -         | nan                          |
| Bulgaria                 | current / historic          | -                  | -      | -         | nan                          |
| Cambodia                 | -                           | current            | -      | -         | nan                          |
| Canada                   | current                     | all                | -      | historic  | nan                          |
| Central African Republic | -                           | current            | -      | -         | nan                          |
| China                    | current / historic pre-1937 | historic           | -      | -         | nan                          |
| Comoros                  | current                     | -                  | -      | -         | nan                          |
| Congo (DR)               | -                           | all                | -      | -         | nan                          |
| Czech Republic           | all                         | -                  | -      | -         | nan                          |
| Denmark                  | all                         | current            | -      | -         | nan                          |
| Djibouti                 | -                           | current            | -      | -         | nan                          |
| Dominican Republic       | -                           | all                | -      | -         | nan                          |
| Egypt                    | current                     | all                | -      | -         | nan                          |
| El Salvador              | current                     | -                  | -      | [MISSING] | nan                          |
| Estonia                  | -                           | historic           | -      | -         | nan                          |
| Finland                  | all                         | -                  | -      | -         | nan                          |
| France                   | current                     | historic -WW2      | -      | -         | nan                          |
| Georgia                  | -                           | current            | -      | -         | nan                          |
| Germany                  | all / active / by company   | -                  | -      | nan       | Idflieg /                    |
| Germany                  | historic                    | historic           | -      | -         | RLM system & RLM list        |
| Greece                   | -                           | all / historic     | -      | -         | nan                          |
| Hungary                  | -                           | current            | -      | -         | nan                          |
| India                    | current                     | historic           | -      | all       | nan                          |
| Indonesia                | -                           | all                | -      | -         | nan                          |
| Iran                     | -                           | all                | -      | -         | nan                          |
| Ireland                  | -                           | all                | -      | -         | nan                          |
| Israel                   | -                           | all                | -      | -         | nan                          |
| Italy                    | -                           | historic - WW2     | -      | -         | nan                          |
| Ivory Coast              | all                         | -                  | -      | -         | nan                          |
| Japan                    | all                         | -                  | -      | historic  | historic / Allied code names |
| Malaysia                 | all                         | -                  | -      | -         | nan                          |
| Moldova                  | -                           | all                | -      | -         | nan                          |
| Montenegro               | -                           | all                | -      | -         | nan                          |
| Morocco                  | current                     | all                | -      | -         | nan                          |
| New Zealand              | all / current               | -                  | -      | -         | nan                          |
| Norway                   | all                         | -                  | -      | -         | nan                          |
| Oman                     | -                           | all                | -      | -         | nan                          |
| Pakistan                 | -                           | all                | -      | -         | nan                          |
| Philippines              | current                     | historic           | -      | -         | nan                          |
| Poland                   | historic - WW2              | -                  | -      | -         | nan                          |



row_idx: 23
col_idx: 4
col_name: Naval
label: -